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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 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.
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 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.
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.
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.
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.
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.
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.
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.
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.
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.
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 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?
Siamese Fighting Fish - Bettas
A detailed profile of the Siamese Fighting Fish, Betta Splendens, including habitat, care, feeding, and breeding.
Which Size Heater Do You Need for Your Aquarium?
Find the right size of heater for your aquarium with this handy heater size guide.
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.
Aquarium Water Temperature
What is the best aquarium water temperature, and why does it matter?
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.
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.
Everything You Need to Know About the Zebra...
A detailed profile of the Zebra Danio- Danio rerio, including habitat, care, feeding, and breeding.
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.
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.
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.
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 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?
Low Oxygen in Aquarium Water
How to recognize and correct low oxygen conditions in a freshwater aquarium.
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.
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 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.
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.
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 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?
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.
Using Activated Carbon in Your Aquarium
The pros and cons of using activated carbon in freshwater aquariums.
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.
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.
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
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.
What Is Nitrite Poisoning in Aquarium Fish?
How to diagnose and treat Nitrite Poisoning
Discolored Aquarium Water
Has your aquarium water ever looked yellow or brownish? Here's what may be causing it, and how to fix it.
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.
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.
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.
Why Flushing Your Fish is Not an Option
Why fish owners should never flush fish down the toilet
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.
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.
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.
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?
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Dwarf Gourami - Trichogaster lalius
A profile of the Dwarf Gourami (Colisa lalia), including habitat, care, feeding, and breeding.
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.
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?
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.
How to Treat Ich in Aquarium Fish
How to diagnose and treat the aquarium fish disease Ichthyophthirius multifilis - Ich
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.
Blue Gourami - Trichogaster trichopterus
A profile of the aquarium fish known as the Blue Gourami (Trichogaster trichopterus), including habitat, care, feeding, and breeding.
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.
Figure Eight Puffer Fish
A Profile of The Figure Eight Puffer, Tetraodon biocellatus, including habitat, care, feeding, and breeding.
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.
Weather Loach
A profile of the Weather Loach, Misgurnus angullicaudatus, including habitat, care, 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.
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.
Betta & Gourami Profiles
Profiles and photos of Betta and Gouramis.
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.
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.
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.
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.
Nitrate Poisoning in Aquarium Fish
How to diagnose and treat nitrate poisoning.
Tiger Barb
A profile of the Tiger Barb, Barbus tetrazona, including habitat, care, feeding, and breeding.
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?
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.
Clown Loach
A profile of the Clown Loach, Chromobotia macracanthus, including habitat, care, feeding, and breeding.
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.
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 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.
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.
Bloodfin Tetra
A profile of the Bloodfin Tetra (Aphyocharax anisitsi), including habitat, care, feeding, and breeding.
Harlequin Rasbora
A profile of the Harlequin (Trigonostigma heteromorpha), including habitat, care, feeding, and breeding.
Pearl Danio - Danio albolineatus - Care and...
How to care for the Pearl Danio, Danio albolineatus, including habitat, care, feeding, and breeding.
Kribensis
A profile of the Kribensis (Pelvicachromis pulcher), 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.
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.
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.
Upside Down Catfish
A profile of the Upside Down Catfish - Synodontis nigriventris, including habitat, care, feeding, and breeding.
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.
Black Widow Tetra
A profile of the aquarium fish known as the Black Widow - Gymnocorymbus ternetzi
Gold Barb
A profile of the Gold Barb, Puntius semifasciolatus, 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.
Selecting a Filter For Your Aqaurium
What to look for when selecting a filter for your aquarium, from your About.com Guide
Angelfish Gallery
Angelfish Gallery
Beard Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with Beard Algae.
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.
5-Star Fish Meals: The Benefits of Live Foods
The benefits of feeding your freshwater fish something more than flakes.
Buenos Aires Tetra
A long time favorite in home aquaria, learn more about the care and breeding of the Buenos Aires Tetra.
Silver Dollar - Metynnis argenteus
A profile of the aquarium fish known as the Silver Dollar (Metynnis argenteus)
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?
Barb Species
Barbs are a lively family of schooling fish. Learn more about the popular Barb species in this overview of Barbs.
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.
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.
Buying an Aquarium for a Child or Teen
Are you thinking of buying a child or teen an aquarium? Feeling lost and wondering where to start? No worries, if you learn the key factors, you can help assure that your young person succeeds. Here's what you need to know.
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.
How to Replace Aquarium Gravel
A Q & A about replacing aquarium gravel: aquarium gravel gravel bed gallon aquarium bacterial colonies beneficial bacteria
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.
Aquarium Fish Disease Velvet
How to diagnose and treat Velvet disease
Kissing Gourami
A profile of the Kissing Gourami - Helostoma temminckii, including habitat, care, feeding, and breeding.
Navigating the Freshwater Forums
The Freshwater Forums is a thriving community that's a great resource of information and ideas. Here is how to quickly reach the forum, and find what you are looking for.
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.
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.
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.
Cory Species
Learn more about the popular Cory catfish species in this overview of Corys.
Reality Aquarium - Algae Journal Part 1
Aquariums in books always look perfect, but in real life they don't always look that way. This series shares real life experiences of aquarium owners, complete with photos, journals they have written, and step by step solutions for problems they may have.
Planting Techniques for Freshwater Aquariums
Want a beautiful aquarium full of live plants? You can do it, with a little help. Plant expert Don Matakis explains how to select substrate, add Laterite, and plant tall stem plants.
Pearl Gourami
A profile of the aquarium fish known as the Pearl Gourami (Trichogaster leeri)
How Do I Upgrade an Aquarium?
Step by step instructions for moving from a smaller to a larger aquarium.
Goldfish Varieties
Did you know there are well over one hundred varieties of goldfish? Learn about various varieties of goldfish as you browse this colorful goldfish gallery.
Glow In The Dark Fish
Banned by some, coveted by others, glow in the dark fish are the latest in long line of altered fish. The debate is hot and heavy over the sales of genetically altered pets. What do you think about them?
Aquairum Heater Placement
Proper placement of the aquarium heater will assure that the tank is heated evenly. Here are simple tips for heater placement.
Aquarium Cleaning Supplies
Need to clean your aquarium? With the proper equipment, it's a breeze. This list includes the items you'll need to make your tank sparkle.
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.
Bronze Cory
A profile of the Bronze Cory (Corydoras aeneus), including habitat, care, feeding, and breeding.
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.
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.
Gourami Species for Aquariums
Gouramis are a relatively hardy and easy to care for family of fish, that are often kept in community aquariums. Learn more about the Gourami family in this overview that compares attributes of popular Gourami species.
How to Seed a New Aquarium & Why It's...
Seeding an aquarium is actually nothing new. It's an old trick that has acquired new popularity. Learn how to seed your new aquarium and why you should try it.
Aquarium Siphons and Gravel Cleaners
The simple aquarium siphon is a powerful tool in the battle to keep your aquarium a clean and healthy environment for your fish and plants. Sometimes it is so simple that its value is overlooked. Learn more about why an aquarium siphon is something you should have.
Aquarium Mini Heaters
Small aquariums and Betta bowls can be challenging to heat. This list of mini-heaters will do the job, without costing an arm and a leg.
Java Moss
Mosses are an excellent plant for aquascaping aquariums. They also are invaluable when spawning and raring fry. One of the most popular and easiest mosses to grow is Java Moss.
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.
Wimple
A profile of the Wimple (Myxocyprinus asiaticus), including habitat, care, feeding, and breeding.
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.
Top 5 Power Filters
More power filters are sold than any other type of aquarium filter; they're easy to set up, reasonably priced and have a wealth of optional features.
Tetra Profiles
Tetra Profiles
Bristlenose Catfish
A profile of the Bristlenose Catfish, Ancistrus cirrhosus, including habitat, care, feeding, and breeding.
What to Do About Cannibalistic Aquarium Fish
Why do fish suddenly turn on one another? Are fish truly cannibalistic?
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.

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