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Freshwater Aquariums: Most Popular Articles

These articles are the most popular over the last month.
Aquarium Sizes and Weights Chart
Sizes and filled weights for standard aquariums.
Causes of Cloudy Water in Your Fish Tank
Virtually everyone experiences it at one time or another. What causes cloudy water, and how do you clear it up? These answers will clear things up for you.
How Much and How Often Should You Feed Aquarium...
One of the most common mistakes made by fishowners is overfeeding fish. Just how much and how often should you feed your fish?
How to Treat aSwim Bladder Disorder in Aquarium...
How to diagnose and treat Swim Bladder Disorder
How to Fight Algae Overgrowth in Your Aquarium
Sooner or later everyone battles algae in their aquarium. This algae reference explains the types of the algae types seen in aquariums, their causes, and cures.
What Causes Brown Algae in My Fish Tank?
Aquarium algae is one of the most frustrating problems to deal with. Here is how to identify and cope with brown algae.
How Long Will My Aquarium Fish Live?
Ever wondered how long your fish will live? Lifespans of aquarium fish vary considerably depending on the species, as well as the care they are given. This list provides a yardstick of what to expect for your fish.
How to Diagnose and Treat Dropsy in Aquarium Fish
Dropsy is not actually a disease, but rather a symptom of a number of diseases. Here is how to diagnose and treat various disorders that cause dropsy in aquarium fish.
Cold Water Fish Species for Your Fresh Water...
When choosing fish for a community tank, one of the factors that should be considered is the optimum water temperature for the species you are choosing. Fish that require warm water should not be kept with fish requiring cooler water. Here are some options for coldwater fish.
8 Popular Fish Species for Your Fresh Water...
A library of freshwater aquarium fish profiles that include; photos, habitat, general care, feeding, and breeding.
How to Manage Nitrates in Your Aquarium
The significance of nitrates in the aquarium are arguably less understood by fishkeepers than the effect of ammonia and nitrites. Although nitrates are not directly lethal in the way ammonia or nitrites are, over time high levels of nitrate have a negative effect on fish, plants and the aquarium in general.
How an Aquarium Cycles
Call it the nitrogen cycle, break-in cycle, start-up cycle, or new aquarium cycle, it’s all the same thing. Knowing how it works will help you keep a healthy environment for your fish.
Tips to Help Rid Your Aquarium of Snails
As long as aquariums have been round, the battle with snails has been waged. Fortunately, it's a battle you can win. Here's how.
How Many Fish Will My Aquarium Hold?
How many fish can your tank safely hold? Learn the pros and cons of different methods for calculating how many fish your aquarium will hold.
How to Clean a Dirty Fish Tank
Cleaning even a very dirty aquarium isn't all that hard when you know what to do. Here are the tools you'll need, and instructions for making your tank look beautiful again.
Which Size Heater Do You Need for Your Aquarium?
Find the right size of heater for your aquarium with this handy heater size guide.
Treating Ammonia Poisoning in Aquarium Fish
Ammonia poisoning can be deadly, but can be treated if caught early. Learn how to treat ammonia poisoning, and what you can do to avoid it in the future.
Aquarium Water Temperature
What is the best aquarium water temperature, and why does it matter?
Can Salt Cure Sick Fish in Freshwater Aquariums?
Next time you have sick fish, the remedy might not be farther away than your kitchen table. Ordinary salt is a useful remedy for the prevention and treatment of several freshwater fish diseases. However, it can also be harmful if used improperly. Here are simple instructions for when and how to use salt in your freshwater aquarium.
How Long Do Bettas Usually Live?
Bettas are so beautiful, but sadly they don't seem to live very long. Is it because of those little jars they are kept in? Just how long is a Betta supposed to live?
What Aquarium Owners Need to Know about the...
Fin Rot is a bacterial disease that occurs quite frequently in aquarium fish. Caused by environmental factors, it is a highly preventable disease. Learn how to diagnose and treat fin rot, and how to prevent it in the first place.
Starting a Fresh Water Aquarium? Avoid These...
Many new aquarium owners make fatal mistakes because they don't know the pitfalls to avoid. Here are top mistakes made when starting a new aquarium, and how to avoid them.
Low Oxygen in Aquarium Water
How to recognize and correct low oxygen conditions in a freshwater aquarium.
List of Aquarium Fish Species by Common Name
A comprehensive library of aquarium fish photos and profiles, sorted by common name.
All About the White Cloud Mountain Minnow
The White Cloud Mountain Minnow, Tanichthys alboneubes, is a popular, easy to care for, freshwater aquarium fish. This article details care, habitat, feeding, and breeding of this attractive fish.
How to Manage Pop-Eye in Aquarium Fish
Pop-eye, or Exophthalmia, is not a disease itself, but it is a sign that something is wrong. Here's what may be going on when a fish presents with a pop-eye.
What You Should Do to Remove White Residue from...
White residue on aquarium glass and equipment is an annoying fact of life. Here's an inexpensive and simple way to remove it.
Siamese Fighting Fish - Bettas
A detailed profile of the Siamese Fighting Fish, Betta Splendens, including habitat, care, feeding, and breeding.
How Long Should You Keep Your Aquarium Lights On?
Aquarium lights usually don't come with a tag saying when to turn them on and off. So, how long should aquarium lights be left on?
Everything You Need to Know About the Zebra...
A detailed profile of the Zebra Danio- Danio rerio, including habitat, care, feeding, and breeding.
Discolored Aquarium Water
Has your aquarium water ever looked yellow or brownish? Here's what may be causing it, and how to fix it.
Is There an Easy Way to Determine the Sex of a...
Determining the sex of your freshwater fish isn't always straightforward. These tips will help you determine if your Gourami is a male or female.
How to Care for a Blood Parrot Fish
Widely available, the man-made hybrid known as the Blood Parrot has been widely debated. Regardless of what side of the fence you are on, they are well established in the aquarium trade and not likely to disappear anytime soon. Here is how to care for Blood Parrots.
Tips for Changing the Water in Your Aquarium
Water changes are the cornerstone of a healthy aquarium. Like it or not, they need to be done. Here's why you should perform them, and tips for making it an easier task.
How Important Is Your Aquarium's pH Level?
What is pH and what is normal in an aquarium? Should you be concerned about pH? Knowing the basics will help avoid disasters that can prove fatal for your fish.
How to Care For and Breed Gourami
Fish from the Gourami family are among some of the most hardy and popular aquarium fish. Although relatively easy to care for, it's wise to learn about their basic needs if you are planning to keep one in your aquarium.
How to Determine the Sex of Your Fish
When trying to breed fish, obtaining a pair is critical. Unfortunately, determining the sex of fish isn't always an easy task. Here are some tips for sexing various species of fish.
Why Stocking Your Aquarium Evenly is Important
The level the fish prefer to swim in is often missed when setting up a community aquarium. If you select fish that prefer different levels, the aquarium be more attractive and your fish will not have to compete with each other for space.
Choosing the First Fish for Your Freshwater...
Your aquarium is set up and you're ready to add fish. Learn about good first fish, and why some common favorites aren't best for a brand new tank.
How Neon Tetra Disease Can Harm Your Aquarium...
Pleistophora hyphessobryconis, or Neon Tetra Disease, is incurable. Quick diagnosis can save healthy fish from falling victim to this killer disease.
Omnivore, Hebivore, Carnivore, What's the...
Do you need to know if your fish is an omnivore, herbivore, or carnivore? Believe it or not, it's wise to know what dietary category your fish fall into. Otherwise you may not be feeding them the foods they need to stay healthy.
Columnaris Disease in Aquarium Fish
Columnaris is often misdiagnosed, due to sometimes having a fungal appearance. Unfortunately fungal treatments are not effective against this bacterial disease Here is how to diagnose and treat Columnaris.
Choosing the Right Size Aquarium Equipment for...
Everyone has basic questions about how much and what size is needed when setting up an aquarium. Here is a collection of information about the size of tanks, heaters, filters, volume of substrate, as well as conversion charts.
How to Reduce the Level of Phosphates in Your...
Phosphates are one of the primary causes of algae overgrowth in the aquarium. Here's what you need to know about phosphates in the aquarium.
The Pros and Cons of Mini-Aquariums
Mini aquariums are hugely popular. Are they the perfect addition to your college dorm, or classroom? Do your homework before buying one, and you'll have a greater chance for success.
Causes and Cures for Green Aquarium Water
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with green water
Is Aquarium Water Testing Really Necessary?
Aquarium water testing is a critical part of fishkeeping, yet is universally overlooked. Often the fish owner is unaware that testing their aquarium water is necessary, or what to test for. Learn the basics of aquarium water testing, and when you should test your water.
Nitrate Poisoning in Aquarium Fish
How to diagnose and treat nitrate poisoning.
How to Fix Cloudy Water in a New Tank
Cloudy water can be both frustrating and baffling. Here are ways to deal with cloudy water in a new aquarium.
Can Changing Your Aquarium's Water Kill Your...
It's a common, but not completely accurate story, that water changes will kill your aquarium fish. How did the story start, and is there any truth in it? Like many misconceptions, there is a kernel of truth behind it.
Why Flushing Your Fish is Not an Option
Why fish owners should never flush fish down the toilet
What Is Nitrite Poisoning in Aquarium Fish?
How to diagnose and treat Nitrite Poisoning
Using Activated Carbon in Your Aquarium
The pros and cons of using activated carbon in freshwater aquariums.
Everything You Need to Know About the Yo Yo Loach
A profile of the Yo Yo Loach (Botia lohachata), including habitat, care, feeding, and breeding.
The Pros and Cons of Real vs Artificial...
Which plant is better for your freshwater aquarium, real or artificial ones? Here are the pros and cons of real versus artificial aquarium plants.
Everything You Need to Know About the Mickey...
Looking for a fun livebearing fish? The Mickey Mouse Platy, Xiphophorus maculatus, makes a great addition to a community aquarium. Here's more about habitat, care, feeding, and breeding.
How Many Bettas Can Be Kept Together in the...
Bettas weren't named Siamese Fighting Fish because they along with each other. Is it ever possible to keep more than one in the same tank?
The Causes and Cures of Cyanobacteria
Cyanobacteria is a common, but difficult to manage, aquarium problem. Here is how to identify and cope with Cyanobacteria, also known as Blue-Green Algae or Slime Algae.
Cleaning Aquarium Plants - Artificial and Live
Plants are an important part of any aquarium decor, but what does an owner do when they get dirty? Learn how to safely clean live or artificial plants.
Suggested Substrate Setup for Live Plants
Choosing the proper substrate for your planted aquarium can make the difference between success and failure. Plant grower, Don Matakis offers his advice on choosing substrates.
A Guide to Everything About Aquarium Heaters
Your aquarium water temperature is an important factor in the comfort and well being of your fish. This aquarium heater guide covers everything you need to know about heaters, from heater types to heater sizes to heater placement.
Blue Gourami - Trichogaster trichopterus
A profile of the aquarium fish known as the Blue Gourami (Trichogaster trichopterus), including habitat, care, feeding, and breeding.
Rosy Barb - Freshwater Aquarium Fish
One of the most popular Barb species is the colorful Rosy Barb. Learn more about then, including preferred tank mates, habitat, feeding and breeding.
Is Bleach Safe for Use in Your Aquarium?
Broach the subject of using bleach to clean an aquarium, and a heated discussion about safety is sure to follow. So is it safe or not? Read on for the answer.
Aquarium Basics Videos
Pictures are great, but video is even better. Learn more about aquariums basics from these videos.
Where Aquarium Fish Prefer to Swim
Choosing fish that prefer different levels within the tank results in a more attractive aquarium and assures that your fish will not have to compete for space. Here is a list, split by preferred level, of one hundred fish that can be part of a community tank. Keep in mind that water conditions (pH, temp, hardness), size, and compatibility must also be considered when choosing fish for your community tank.
A to Z Index of Common Names of Freshwater Fish
Here is a handy list of over a thousand common fish names cross referenced to their scientific names.
Missing Aquarium Fish
Description: Every aquarium owner has had an occasion when they looked at their tank and realize that they couldn't locate all their fish. Perhaps the fish eventually reappeared, but other times the fish is never found. What causes fish to disappear, and in some cases, never be found?
Vacation and Holiday Fish Care and Feeding
The care and feeding of aquarium fish is a big concern to fish owners planning a vacation. This care and feeding checklist assures that your freshwater aquarium fish will be well provided for while you are away.
Dwarf Gourami - Trichogaster lalius
A profile of the Dwarf Gourami (Colisa lalia), including habitat, care, feeding, and breeding.
What's That Strange Foam on Your Aquarium Water?
Foam floating on your aquarium water is nothing short of disturbing. Where did it come from? Is it dangerous? What can be done to get rid of it? This article will answer all those questions about foamy aquarium water.
How to Replace Aquarium Gravel
A Q & A about replacing aquarium gravel: aquarium gravel gravel bed gallon aquarium bacterial colonies beneficial bacteria
How to Lower High Water Temperatures in Your...
Elevated water temperatures can be dangerous or even lethal to fish if they remain high for a period of time. Here are the steps to take if you have a heat problem.
How to Treat Ich in Aquarium Fish
How to diagnose and treat the aquarium fish disease Ichthyophthirius multifilis - Ich
What You Need to Know Before You Buy a New...
Biological and mechanical filtration is critical for maintaining a healthy environment in your aquarium. The aquarium, filter type, size, and media you select will depend on many factors. Don't let all the choices overwhelm you. Before you buy an aquarium filter, arm yourself with the basics about the type of aquarium filter you need.
What is the Best Environment for a Betta?
Bettas are usually displayed in small unheated bowls at the pet shop, but is that the proper environment for them? Here are tips for the best Betta habitat.
Betta & Gourami Profiles
Profiles and photos of Betta and Gouramis.
How Do I Heat a Betta Tank?
Bettas require warm water to be happy and healthy. The problem is that Bettas are often kept in small bowls or tanks. These mini heaters are a perfect solution.
Proper Nutrition for Your Aquarium Fish
Nutrition is important for fish health. This comprehensive fish feeding resource of articles and product reviews about foods will help you keep your fish in top health.
Replacing Aquarium Filter Media: What's the...
Aquarium owners often are perplexed when it comes to filling their canister filter. This article helps makes sense of the recommended filter media order.
Sponge Filters for Aquariums
Sponge filters are overlooked by my aquarium owners, even though they are ideal for certain situations. Learn the pros and cons of sponge filters, and what they are best used for.
How to Combat the Aquarium Pest Hydra
Hydra is a soft-bodied freshwater polyp that sometimes is sometimes accidentally introduced to freshwater aquariums. Here's how to get rid of them.
How Much Should I Feed My Fish?
How much and how often a fish should be fed is one of the first questions a new owner has. Here are the answers to those age old questions.
How to Use Hard Water in Your Aquarium
Hard water doesn't mean you can't keep fish, nor does it mean you have to buy expensive treatments and engage in an ongoing battle to make your water softer. Here are some aquarium fish that will thrive, even in hard water.
Is it Safe to Keep a Betta in a Vase
Bettas are often kept in small bowls, or worse yet, flower vases. Learn why a Betta should not be kept in a flower vase.
How to Clean a Small Fish Bowl in 4 Easy Steps
Small fish bowls require frequent cleaning. Learn how to clean a fish bowl quickly and safely.
Pesky Oil Slicks in Your Tank: Causes and...
Ever notice an ‘oil slick’ in your tank? If you did, you were probably scratching your head wondering where it came from, if it’s harmful and how to get rid of it. Here's the answers to those questions.
Is Gravel Necessary in an Aquarium?
Is having gravel, or any other kind of substrate, necessary in an aquarium? Generally the answer is yes, but there are occasions when no substrate at all is best. This FAQ explains why you need, or don't need, substrate.
Clown Loach
A profile of the Clown Loach, Chromobotia macracanthus, including habitat, care, feeding, and breeding.
How To Feed Aquarium Fish Fry
Feeding newly hatched fry in an aquarium can be a challenge. This article discusses how to feed different types of aquarium fish fry.
Schooling Fish
One of the most enjoyable scenes in an aquarium is a group of fish swimming in unison, changing directions in an instant, yet never colliding with each other. How are they able to swim in unison?
Upside Down Catfish
A profile of the Upside Down Catfish - Synodontis nigriventris, including habitat, care, feeding, and breeding.
Commonly Asked Questions About Bettas
Bettas, also known as Siamese Fighting Fish, are one of the most popular freshwater fish, and often the most poorly cared for.
Tiger Barb
A profile of the Tiger Barb, Barbus tetrazona, including habitat, care, feeding, and breeding.
How to Keep Your Aquarium Fish Healthy
When fish are sick, they can't tell you what is wrong. If your fish appear to be sick, this resource will help you diagnose and treat them. You'll also find tips to prevent future illness.
Harlequin Rasbora
A profile of the Harlequin (Trigonostigma heteromorpha), including habitat, care, feeding, and breeding.
Buying an Aquarium? Here's What to Know
Aquariums are one of the most popular hobbies in the world. Who can resist the lure of a beautiful tank full of colorful fish? Before jumping in with both feet, here are a few things you should consider.
Choosing the Right Canister Filter for Your...
Canister filters are excellent for medium to large size tanks. These are my top choices for canister filters.
Weather Loach
A profile of the Weather Loach, Misgurnus angullicaudatus, including habitat, care, feeding, and breeding.
Why Do My Fish Hide All the Time?
Fish that hide all the time are a baffling and frustrating problem for the owner. Here are reasons why they hide how to coax your fish out into the open where you can enjoy him.
Gold Barb
A profile of the Gold Barb, Puntius semifasciolatus, including habitat, care, feeding, and breeding.
What are Those Tiny White Worms In My Tank?
The presence of tiny white worms can be very distressing to any aquarium owner. Although they are not harmful to the fish, they are a sign of problems in the aquarium.
Causes and Cures for Slime Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with Slime Algae.
Causes and Cures for Spot Algae in Freshwater...
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with spot algae.
Aquarium Fish Disease Velvet
How to diagnose and treat Velvet disease
Danio Species
Danios are active school fish that are quite hardy. They do well in cool temperatures, making them a great choice for unheated aquariums. Learn more about the popular Danio species in this overview of Danios.
Figure Eight Puffer Fish
A Profile of The Figure Eight Puffer, Tetraodon biocellatus, including habitat, care, feeding, and breeding.
Can You Get Health Benefits from Keeping an...
Do you have a stressful life, high blood pressure, insomnia? Keeping an aquarium may be good therapy for you. Studies going back as far as the late 80’s have shown that gazing at aquarium fish reduces stress and subsequently lowers blood pressure.
Treating Aquarium Water
A primer of water treatment products, and what they are used for.
Pearl Danio - Danio albolineatus - Care and...
How to care for the Pearl Danio, Danio albolineatus, including habitat, care, feeding, and breeding.
5-Star Fish Meals: The Benefits of Live Foods
The benefits of feeding your freshwater fish something more than flakes.
What Is Old Tank Syndrome in a Freshwater...
What is old tank syndrome? Is it when the tank wears out, or equipment becomes out of date? Old tank syndrome refers to more than just the age of the tank, as this article will explain.
Loach Species
Loaches are fun and generally easy to care for fish that do well in most community aquariums. Learn more about the popular Loach species in this overview of Barbs.
Julii Cory - Corydoras julii
The Julii Cory is one of the more popular members of the Corydoras family. They are also often confused with another similar species, the Three Line Cory. Learn how to differentiate the Julii Cory and what they require for care, including: aquarium setup, tank mates, care, feeding, sexual differences and breeding.
Black Widow Tetra
A profile of the aquarium fish known as the Black Widow - Gymnocorymbus ternetzi
A profile of the Kribensis (Pelvicachromis pulcher), including habitat, care, feeding, and breeding.
Bloodfin Tetra
A profile of the Bloodfin Tetra (Aphyocharax anisitsi), including habitat, care, feeding, and breeding.
Silver Dollar - Metynnis argenteus
A profile of the aquarium fish known as the Silver Dollar (Metynnis argenteus)
The Correct Way to Acclimate Your New Aquarium...
How you acclimate newly acquired aquarium fish can make all the difference in their health and well being. Here is how to accliimate aquarium fish safely.
Barb Species
Barbs are a lively family of schooling fish. Learn more about the popular Barb species in this overview of Barbs.
Are Piranhas Dangerous?
Tales of piranhas devouring hapless humans have circulated for many years. Are they a serious threat to people, or is it an urban legend?
Aquarium Water Clarifiers
Sometimes referred to as flocculants, these water clarifier products are designed to help remove fine particulate matter from the water.
What is a Labyrinth Fish?
Fish are amazing - some can fly, others can climb trees, and some, such as the labyrinth fish, can breathe out of water. How do they breathe air without lungs? Read on to find out.
Aquairum Heater Placement
Proper placement of the aquarium heater will assure that the tank is heated evenly. Here are simple tips for heater placement.
How Do I Upgrade an Aquarium?
Step by step instructions for moving from a smaller to a larger aquarium.
Bronze Cory
A profile of the Bronze Cory (Corydoras aeneus), including habitat, care, feeding, and breeding.
How to Determine the Gender of a Betta Fish
Although it may seem simple to determine Betta gender, in some cases it is not as obvious as you may think. Here are ways to accurately determine Betta sex.
Aquarium Water Basics
Water is the most important component of the environment for your fish. This aquarium water reference covers all the key factors you need to successfully maintain ideal water conditions for your aquarium fish.
Coolie Loach or Kuhli Loach
One of the most recognizable and popular loaches, the Coolie Loach - Pangio kuhlii, is also an easy to care for fish. Here's how to keep them happy and healthy.
Aquarium Water Test Kits
Testing your aquarium water is a key component of maintaining a healthy environment for your fish. Learn more about which kits are important for your needs.
Beard Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with Beard Algae.
Using Zeolite to Keep Your Aquarium Clean
What is zeolite, and when should it be used in an aquarium? This article answers those questions about zeolite.
Angelfish Gallery
Angelfish Gallery
Denison Barb - Puntius denisonii
One of the larger Barbs, the Denison Barb is a colorful and interesting fish keep, but requires a large aquarium. Learn more about habitat, care, and feeding this attractive fish.
Methylene Blue
Methylene Blue is used in aquariums as a disinfectant, anti-fungal and anti-parasitic. It is also used to treat ammonia and nitrite poisoning.
Do Rocks Affect pH of Aquarium Water?
Rocks and other items used to decorate your aquarium can and will affect the water chemistry. Here is what to look for when considering rocks for your aquarium.
What to Do About Cannibalistic Aquarium Fish
Why do fish suddenly turn on one another? Are fish truly cannibalistic?
Aquarium Thermometers Types
Aquarium thermometers are an important but often overlooked piece of equipment. This guide covers different thermometer types, including the pros and cons of each.
Choosing Aquarium Fish Foods
Choosing the right food for your fish is a key factor in maintaining the health and long life of your pet. Although there is no single food that is good for every fish, if you follow these four basic steps you won't go wrong.
What is the Difference Between Chlorine and...
Chlorine or Chloramine? What's the difference, and how does it affect your aquarium? Should you be concerned about Chloramine? Here's the answer.
How to Tell Neon and Cardinal Tetras Apart
Neon Tetra and Cardinal Tetras look similar, but they aren't the same species. In fact, they have some distinctly different needs that owners should be aware of. Learn how to tell the difference between a Neon and Cardinal Tetra, and some important facts about each species.
Brazilian Pennywort
Hydrocotyle leucocephala, also known as Brazilian Ivy or Pennywort, is a very popular and easy to grow aquarium plant. Learn how to grow and care for it.
Pearl Gourami
A profile of the aquarium fish known as the Pearl Gourami (Trichogaster leeri)
Kissing Gourami
A profile of the Kissing Gourami - Helostoma temminckii, including habitat, care, feeding, and breeding.
Neon Tetra
A profile of the aquarium fish known as the Neon Tetra - Paracheirodon innesi
Artificially Colored Aquarium Fish
Not all brightly colored fish come by their colors naturally. Do you know if your fish has been painted or dyed? Before you make a purchase, you should know what you are getting.
White Skirt Tetra
A profile of the aquarium fish known as the White Skirt Tetra (Gymnocorymbus ternetzi)
Panda Cory
Corydoras panda. Freshwater Aquariums.
Common Fish Names Beginning With P
Learning scientific names of fish can be daunting, so we all tend to use common names. However, if you wish to do research on your fish, knowing the scientific name is invaluable. Here is a handy list of common fish names that begin with the letter P, cross referenced to their scientific names.
Platy Types
Platys come in a wide variety of colors and patterns. This list explains the more common color, pattern, and fin variations, complete with images.

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