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Freshwater Aquariums: Most Popular Articles

These articles are the most popular over the last month.
Our Guide to Common Aquarium Weights and Sizes
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 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.
Everything Aquarium Owners Need to Know about...
Dropsy is a catcall symptom that is caused by a number of diseases. Here is how to diagnose and treat various disorders that cause dropsy in aquarium fish.
How to Identify, Treat and Prevent Swim Bladder...
How to diagnose and treat Swim Bladder Disorder
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 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.
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.
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 to Avoid Ammonia Poisoning of Your Aquarium
How to diagnose and treat Ammonia Poisoning
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.
What You Should Know About the Biological...
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.
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.
Which Size Heater Do You Need for Your Aquarium?
Find the right size of heater for your aquarium with this handy heater size guide.
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.
Siamese Fighting Fish - Betta Splendens
A detailed profile of the Siamese Fighting Fish, Betta Splendens, including habitat, care, feeding, and breeding.
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 Much Should You Feed Aquarium Fish?
One of the most common mistakes made by fishowners is overfeeding fish. Just how much and how often should you feed your fish?
The Best Cold Water Species for Your Fresh...
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.
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. Here is how to diagnose and treat Fin Rot in aquarium fish, as well as how to prevent it in the first place.
How to Treat a Common Aquarium Fish Parasite
How to diagnose and treat the aquarium fish disease Ichthyophthirius multifilis - Ich
Zebra Danio - Danio rerio
A detailed profile of the Zebra Danio- Danio rerio, including habitat, care, feeding, and breeding.
Low Oxygen in Aquarium Water
How to recognize and correct low oxygen conditions in a freshwater aquarium.
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.
Aquarium Water Temperature
What is the best aquarium water temperature, and why does it matter?
Water pH
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.
Pop-eye - Exophthalmia
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.
Nitrite Poisoning
How to diagnose and treat Nitrite Poisoning
Neon Tetra Disease
How to diagnose and treat Neon Tetra Disease (Pleistophora hyphessobryconis)
Good First Fish
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.
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.
8 Popular Fish Species You Should Have in Your...
A library of freshwater aquarium fish profiles that include; photos, habitat, general care, feeding, and breeding.
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.
Columnaris - Flexibacter columnaris
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.
Activated Carbon in the Aquarium
The pros and cons of using activated carbon in freshwater aquariums.
Gourami Care and Breeding
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.
Caring for a Blood Parrot
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.
Phosphates in the Aquarium
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.
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 Aquarium Water Testing Really Necessary?
Aquarium water testing is a critical part of fishkeeping, yet is universally overlooked. Often the reason is due to the fact that the fish owner is unaware that testing their aquarium water is necessary, or what to test for. This feature covers all the basics of aquarium water testing, and explains when you should test your water.
White Cloud Mountain Minnow - Tanichthys...
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.
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.
Omnivore, Hebivore, Carnivore, What's the...
What are they anyway, and what difference does it make? Believe it or not, it's wise to know what dietary category your fish fall into. If you don't, you may not be feeding them the foods they need.
Holiday and Vacation Fish Care
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 Long Should Aquarium Lights be Left 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?
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.
What are These Tiny White Worms?
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.
Nitrate Poisoning
How to diagnose and treat nitrate poisoning.
Green Water
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with green water
How Much Do I Need?
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 Determine Fish Sex
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.
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.
Before You Buy an Aquarium Filter
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 Do I Sex a Gourami?
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.
Aquarium Canister Filters
Canister filters are excellent for medium to large size tanks. These are my top choices for canister filters.
Don't Flush That Fish!
Why fish owners should never flush fish down the toilet
Do Water Changes Kill Fish?
It's a commonly told, but not completely accurate story, that water changes are bad and 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 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.
How Long Do Bettas 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?
Bleach For Aquarium Use
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.
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.
Preferred Levels of Community Fish
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.
Yo Yo Loach - Botia lohachata
A profile of the Yo Yo Loach (Botia lohachata), including habitat, care, feeding, and breeding.
How Many Bettas Can Be Kept Together in the...
Compatibility is important when choosing fish for your aquarium. Some species, such as the Betta, aren't even compatible with their own kind.
Cleaning Aquarium Plants
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.
Aquarium Filter Media Order
Aquarium owners often are perplexed when it comes to filling their canister filter. This article helps makes sense of the recommended filter media order.
Blue Gourami - Trichogaster trichopterus
A profile of the aquarium fish known as the Blue Gourami (Trichogaster trichopterus), including habitat, care, feeding, and breeding.
Aquarium Heater Guide
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.
Acclimating Aquarium Fish
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.
How Do I Lower High Water Temps?
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.
Figure Eight Puffer - Tetraodon biocellatus
A Profile of The Figure Eight Puffer, Tetraodon biocellatus, including habitat, care, feeding, and breeding.
Beard Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with Beard Algae.
Getting Rid of Aquarium Oil Slicks
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.
Velvet - Oodinium pilularis
How to diagnose and treat Velvet disease
Feeding Your Fish Live Foods
The benefits of feeding your freshwater fish something more than flakes.
Is the Dwarf Gourami the Kind of Fish You Want...
A profile of the Dwarf Gourami (Colisa lalia), including habitat, care, feeding, and breeding.
Clown Loach - Chromobotia macracanthus
A profile of the Clown Loach, Chromobotia macracanthus, including habitat, care, feeding, and breeding.
What is the Best Environment for a Betta?
Advice for setting up the most healthy environment for a Betta.
Is Gravel Necessary?
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.
Should I Keep My 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.
Tiger Barb - Barbus tetrazona
A profile of the Tiger Barb, Barbus tetrazona, including habitat, care, feeding, and breeding.
Mickey Mouse Platy - Xiphophorus maculatus
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.
Why You Need to be Wary of Cloudy Water in Your...
Cloudy water can be both frustrating and baffling. Here are ways to deal with cloudy water in a new aquarium.
Replacing Aquarium Gravel
A Q & A about replacing aquarium gravel: aquarium gravel gravel bed gallon aquarium bacterial colonies beneficial bacteria
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?
Harlequin - Rasbora heteromorpha
A profile of the Harlequin (Rasbora heteromorpha), including habitat, care, feeding, and breeding.
How Do I Heat a Betta Tank?
How Do I Heat a Betta Tank? Freshwater Aquariums.
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.
Foam on 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 foam on aquarium water.
Selecting a Filter For Your Aqaurium
What to look for when selecting a filter for your aquarium, from your About.com Guide
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.
Slime Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with Slime Algae.
Using Outdoor Gravel in an Aquarium
The question is an old one, and is still debated. Can outdoor rocks gravel, or sand be used in an aquarium? Here's my take on the question.
Buenos Aires Tetra - Hyphessobrycon anisitsi
A long time favorite in home aquaria, learn more about the care and breeding of the Buenos Aires Tetra.
What You Need to Know about the Silver Dollar...
A profile of the aquarium fish known as the Silver Dollar (Metynnis argenteus)
Pearl Gourami - Trichopodus leerii
A profile of the aquarium fish known as the Pearl Gourami (Trichogaster leeri)
Weather Loach - Misgurnus angullicaudatus
A profile of the Weather Loach, Misgurnus angullicaudatus, including habitat, care, feeding, and breeding.
Fish Health
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.
Black Widow Tetra - Gymnocorymbus ternetzi
A profile of the aquarium fish known as the Black Widow - Gymnocorymbus ternetzi
Rosy Barb
A profile of the Rosy Barb, Puntius conchonius, including habitat, care, feeding, and breeding.
Denison Barb - Puntius denisonii
A profile of the Denison Barb - Puntius denisonii, including habitat, care, feeding, and breeding.
How Do I Upgrade An Aquarium?
Step by step instructions for moving from a smaller to a larger aquarium.
How To Determine Betta Gender
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.
Feeding 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.
Java Moss - Taxiphyllum barbieri
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.
How an Aquarium Can Improve Your Health
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.
Coolie Loach - Pangio kuhlii
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.
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.
What is Seeding a New Aquarium?
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.
Gold Barb - Puntius semifasciolatus
A profile of the Gold Barb, Puntius semifasciolatus, including habitat, care, feeding, and breeding.
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?
Kissing Gourami - Helostoma temminckii
A profile of the Kissing Gourami - Helostoma temminckii, including habitat, care, feeding, and breeding.
Converting to Live Plants
Many aquarium owners have gazed at planted aquariums and wished they could have live plants. Unfortunately most don't know where to start. This series of articles follows a new aquarium owner, Sheila, as she converts her tank from plastic to live plants. Every step of her journey will be documented in her own words, along with tips and advice from an expert plant grower and your Guide.
Bristlenose Catfish - Ancistrus cirrhosus
A profile of the Bristlenose Catfish, Ancistrus cirrhosus, including habitat, care, feeding, and breeding.
How to Clean a Fish Bowl
How to Clean a Fish Bowl. Freshwater Aquariums.
Upside Down Catfish - Synodontis nigriventris
A profile of the Upside Down Catfish - Synodontis nigriventris, including habitat, care, feeding, and breeding.
Do I Need a Special Stand for My Aquarium?
Unsure if you really need a stand for the aquarium you are going to buy? Or perhaps aquarium stands not on your budget. Here are the reasons why you may, or may not, need to purchase a special aquarium stand.
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 Air Pumps
Aquarium air pumps are used to run air bubblers, bubble curtains, filters, and even decorations. This list covers the top aquarium air pumps for freshwater aquariums.
Do Rocks Affect Aquarium Water pH?
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.
Pearl Danio - Danio albolineatus
How to care for the Pearl Danio, Danio albolineatus, including habitat, care, feeding, and breeding.
Aquarium Water Movement
Aquarium water movement is vital for maintaining a health habitat for your fish. Learn why, and ways to keep your aquarium water circulating in a healthy way.
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.
Betta & Gourami Profiles
Profiles and photos of Betta and Gouramis.
What is Old Tank Syndrome?
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.
Water Hardness Numbers
What do the water hardness numbers actually mean? Is 25 mg/l soft or hard? This reference chart shows what hardness numbers mean, from soft to hard.
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.
Bronze Cory - Corydoras aeneus
A profile of the Bronze Cory (Corydoras aeneus), including habitat, care, feeding, and breeding.
Aquairum Heater Placement
Proper placement of the aquarium heater will assure that the tank is heated evenly. Here are simple tips for heater placement.
Bloodfin Tetra - Aphyocharax anisitsi
A profile of the Bloodfin Tetra (Aphyocharax anisitsi), including habitat, care, feeding, and breeding.
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.
Aquarium Light Fixture Guide
One of the decisions you must make when purchasing an aquarium is choosing the type of light you want. This light fixture guide will help sort out the proper size fixture and bulbs for your tank.
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.
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.
Barb Species
Barbs are a lively family of schooling fish. Learn more about the popular Barb species in this overview of Barbs.
Spot Algae
Algae is one of the most frustrating problems to deal with. Here is how to identify and cope with spot algae.
Aquarium Water Clarifiers
Sometimes referred to as flocculants, these water clarifier products are designed to help remove fine particulate matter from the water.
Aquarium Checklist
Planning to purchase a new aquarium for yourself, or as a gift? You should take a list with you when you go shopping. Here's a checklist of all the items you'll need for a new aquarium, complete with tips and suggestions.
List by Common Name
A comprehensive library of aquarium fish photos and profiles, sorted by common name.
Goldfish Bowls
Goldfish bowls are common in department stores as well as most pet shops. Ask anyone who had a goldfish as a kid and odds are they kept it in a goldfish bowl. Learn why Goldfish bowls aren't what they aren't cracked up to be.
Serpae Tetra - Hyphessobrycon eques
Serpae Tetras are an brightly colored schooling fish that does well in a community aquarium. Here is how to care for Serpae Tetra - Hyphessobrycon eques
Heater Types
Fish must rely on the temperature of the water to maintain their body temperature. That means that many aquariums require a heater, especially in northern climates. Here are the pros and cons of the different heater types.
Before You Buy An Aquarium
When purchasing an aquarium it is important to consider the needs of the fish that will live it. Here are the important factors to consider before you buy an aquarium.
Kribensis - Pelvicachromis pulcher
A profile of the Kribensis (Pelvicachromis pulcher), including habitat, care, feeding, and breeding.
Flake Foods
Flake foods are the staple for aquarium fish, but are they the best option? Here are the basics of choosing flake foods for your fish.
What to Consider Before Buying an Aquarium
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.
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.
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.
Adding Plants to Your Freshwater Aquarium
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.
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