Fish Blog

If you’re looking to swim with the big fish… or the small fish… or anything in between, our in-depth Fish Blog section covers everything an avid aquarist needs to know.

Covering all types of aquarium tanks, to cool and interesting ideas for your next fishy endeavor, PetGuide.com’s Fish Blog is the perfect spot for experienced and beginner fish enthusiasts alike. We cover the various aspects of fish keeping as a hobby – from simple planted tanks to complex marine environments, as well as aquarium fish and their compatibility with other species. Dive right into the fascinating world of aquariums!

If you are in need for some tips and ideas on decorating your fish tank with beautiful plants, make sure to hop on over to our Aquatic Plants section. In case you have a saltwater tank and want to create a unique environment for its inhabitants, Coral Reefing is definitely an option worth looking into. Reef tanks are not only great for the fish but a magnificent centerpiece for your home as well! Depending on the type of water in your tank, you will also find invaluable advice and how-to guides in our Freshwater and Saltwater blog chapters, or useful reviews of aquarium equipment in our Fish Products section of the blog.

Wondering about adding a new creature into your aquarium? Read up on our aquarium fish species recommendations, or head on over to our Invertebrates blog, to find out how to chose, introduce and care for various marine critters, including species such as crabs, clams, starfish, and much more.

Create a stunning miniature ecosystem in your aquarium. Petguide.com’s Fish blog has all the resources you’ll need to create, decorate and maintain a gorgeous fish tank, as well as guides on choosing and caring for aquarium fish and other aquatic creatures that will inhabit it!

Aquarium Snails: The Good, The Bad, And The Ugly

What starts out as a small nuisance may end up becoming a "Snail Apocalypse!" Here's how these visitors get into your aquarium and what you can do about it.

Coral Reef-Safe Fish Species for Saltwater Tanks

Pairing the right fish with the right coral makes for a vibrant and healthy aquarium. Here's what saltwater fish will enjoy your coral reef tank.

How to Tell If Aquarium Hobby Right for You

Keeping an aquarium is fun and rewarding - it also takes work. Do you have what it takes to dive into the aquarium hobby?

Can Betta Fish Live with Other Fish?

Betta fish - also known as Siamese fighting fish - are some of the most striking freshwater fish you can add to an aquarium. But can they mix with other fish in the tank?

Add Color to Your Tank With Freshwater Shrimp

Have you ever thought of adding freshwater shrimp to your aquarium? A wonderful addition to any tank, shrimp brighten and bring zest to a tank.

What You Need to Know About Feeding Your Fish

A healthy fish aquarium starts with the right nutrition. There are many types of fish food on the market – which one should you choose? When it comes t…

Growing and Propagating Your Own Coral

Feel like fragging? If you want to propagate your own coral, you sure do! This cost-effective practice lets you grow your own coral.

5 Plants Picks for Your Brackish Aquarium

It's not saltwater, it's not freshwater - brackish aquariums offer a bit of both! But finding the right plants for this type of tank can prove to be tricky.

The Best Aquarium Gravel Cleaners

You may not think much about it, but the gravel at the bottom of your tank needs certain care. Here are our picks for the best aquarium gravel cleaners.

Best Aquarium Gravel for Freshwater Tanks

What's at the bottom of your aquarium? If you're looking for substrate, check out our picks for the best aquarium gravel for freshwater tanks.

Best Fish Food for Aquarium Fish

What do you plan to feed your fish? If you're just starting out with a tank, you'll want to choose the best fish food for aquarium fish.

6 Easy Hacks to Cure Fish Boredom

Just like any other pet, fish can become bored, too. And while they won't chew up your shoes, keeping them occupied will ensure they live a healthier life.

Biotope Tanks: What Are They and How Do You Cultivate One?

Before you buy, have you narrowed down your choice of fish tank? If you're looking into freshwater, the Biotope tank may be just what you're looking for.

Best Betta Tank Decorations

Do you want to complement your beautiful Betta fish? Why not fill your aquarium with the awe-inspiring Betta tank decorations?

Best Aquarium Supplies for Biological Filtration

Balance is the key to a healthy aquarium and filtration plays a major role. That's why you need know about the best aquarium supplies for biological filtration.

What Causes PH Changes and How to Fix Them

What's the chemistry like between your aquarium fish and the water they swim in? Keeping the pH of your tank water is a vital element to healthy fish.

Best Natural-Looking Aquarium Decorations

When decorating your aquarium, you may want to create a look inspired by nature. We've picked out some of the best natural-looking aquarium decorations.

Top 5 Live Plants to Use in Brackish Aquariums

A mix of salt and freshwater, brackish aquariums present its own set of challenges. Here are a few plants that hold up in this type of tank.

Take a Walk On the Wild Side of Bettas

Take a walk on the wild side! You know about bettas, but do you know about wild betta fish? Let's look at wild bettas that can be kept in an aquarium.

Tank Stocking: The Truth About The 1 Inch Per Gallon Rule

You've heard about the "one inch of fish per gallon" rule, but there are other factors to keep in mind when you're first stocking your aquarium.

Betta Leaf Hammock is the Perfect Fit for Any Tank

Researchers suggest keeping bettas happy by housing them in large, landscaped tanks. This hammock is a great addition to any enclosure.

How to Use Aquatic Mosses in Your Planted Tank

To make your tank truly spectacular, try adding moss to the mix. With many types to choose from, moss adds a lush and natural touch to your aquarium.

Understanding the Basics of Freshwater Aquarium Lighting

The right lights make all the difference to your freshwater aquarium. Offering much more than just illumination, aquarium lighting helps feed your plants.

Best Saltwater Aquarium Kit

A saltwater aquarium kit lets you create a gorgeous tank without much hassle - they contain everything you need to get started.

Best Fish Food for Algae Eaters

Finding the perfect combination of aquarium inhabitants is an art. You want to find species that are compatible with each other in terms of size and color, but you also have to think about aggression and diet as well. Once you’ve established the ideal balance, it can be challenging to add a new inhabitant to the tank. If you’re struggling to control problem algae, however, adding a new species could be your best option. Bristlenose Plecostomus, oto cats, and other algae eaters are a natural and long-term solution for problem algae, but they require care of their own.

Best Reef Aquarium Supplements

There are unique challenges to keeping a reef aquarium. To properly maintain this type of tank, you need the right reef aquarium supplements.�

Freshwater Clams: An Underutilized Invertebrate

Does your aquarium have a couple of clams? You need to add a few to your tank – these invertebrates are for more than just show. When you think about c…

Taking a Closer Look at Oscars

One of the most popular aquarium fish species is the Oscar. Brilliantly colored and quite smart, there's a lot you didn't know about these tough fish.

Is It Safe to Keep Fish in a Small Bowl?

While fish bowls are often marketed as a simple, low-maintenance solution (especially for beginners), they fall short in several critical ways when it comes to keeping fish healthy and happy. Let’s explore why.

Best Aquarium Filter Media

There are parts of your aquarium that work behind the scenes to ensure that it works properly. Here's how to choose the best aquarium filter media for your tank.�

What Plants Can I Pair With Plant-Eating Fish?

Your planted tank sure looks good... good enough to eat! Here's what you need to know if you don't want fish eating all of the plants in your aquarium.

Best Automatic Aquarium Feeders

We've put together some tips for choosing and using an automatic aquarium feeder and our top 10 picks for the best automatic aquarium feeders.

Why Is My Fish Lying at the Bottom of the Tank?

Fish can have all sorts of quirky behaviors, but spotting your fish lying motionless at the bottom of the tank can be a cause for concern. While it might look alarming, this isn’t always a sign of illness.

Best Aquarium Filters

Go with the flow and keep your tank sparkling clean. Choose from our list of the best aquarium filters to ensure your tank is properly maintained.

What You Need to Know About the Nitrogen Cycle

The Nitrogen Cycle is important if you're interested in cultivating a thriving aquarium. Let's talk about the basics and why you need to know about it.

Confessions of a Tank Addict: YouTube Fish Fanatic Rachel O’Leary

The first step is admitting you have a problem. The second step is to set up a YouTube channel and record your tank obsession - just like Rachel O'Leary!

Best Aquarium Filters for a Beginner Tank

An aquarium filter is an important part of your tank's water quality. Choosing the right one for your first tank is vital - here's our list of the best aquarium filters for a beginner tank.

Keeping Carnivorous Plants in Your Home Aquarium

Don’t let the name scare you off. Adding carnivorous plants to your tank can take your aquarium to a new level of uniqueness. When you are ready to s…

The Pros and Cons of CO2 in an Aquarium

CO2 in your aquarium can take your plants from average to extraordinary. But before adding extra to your tank, make sure you know its pros and cons.

Fishy Secrets Revealed: The Pros’ Most Embarrassing Stories

We all have those forehead-slapping moments when we make a stupid mistake. Hey, not to worry - even the most seasoned of fish pros have made a few missteps.

Why You’ll Want to Add Mystery Snails to Your Aquarium

Mystery snails are a welcome addition to an aquarium. Colorful and community oriented, these crustaceans will clean up after themselves and tank mates.

What Are the Most Attractive Corals for a Reef Tank?

Broccoli, bubbles and... open brains? These are just a few coral types that will bloom in your aquarium and give your reef environment life.

Best 10 Gallon Fish Tanks

Getting a 10 gallon fish tank is an excellent starting point as it is not overwhelmingly big or too challenging. Take a look at he best 10 gallon aquariums!

Radiant Reef: A Rainbow of Hard Coral

An underwater, eye-dazzling view! Available in all the colors of the rainbow, hard corals can turn your tank into a brilliant spectrum of wonder.

The Best Aquarium Sand

What are you decorating the bottom of your tank with? We've got some ideas - here's the best aquarium sand on the market.

4 Popular Cryptocoryne Species for Your Planted Tank

Lush and colorful, the Cryptocoryne species is a popular pick for planted tank enthusiasts. Why not add these vibrant aquatic plants to your tank?

7 Common Types of Algae Found in Freshwater Aquariums

It's not easy being green... or brown... or red. How many different types of freshwater algae are you familiar with and how to you control it?

Best Aquarium Stands and Cabinets

You can't just put a full aquarium on any piece of furniture - it has to be made to take the weight of your tank. Here are our picks for awesome aquarium stands and cabinets.�

Aquascaping: A Tank of Beauty

A tank can be a place to flex your artistic muscle. If you'd like to set up a stunning aquascape, you'll want to follow these tips to do it right.

Best Aquarium Protein Skimmers

Keeping your aquarium water clean and clear is essential for the health and wellness of your tank inhabitants.�Here are our top picks for the best aquarium protein skimmers.

5 Common Mistakes Made by Reef Keepers

When you're starting out, the smartest thing to do is learn from others' mistakes. Minimize your reef keeping boo-boos and take some advice from the pros.

Why You Need The API Master Test Kit

Here's a test you don't have to study for. The API Master Test Kit has everything you need to maintain and monitor aquarium conditions.

Best Aquarium Testing Supplies

Depending on what kind of fish you're stocking your tank with, you're going to need to test the water to make sure it's just right. Here are the best aquarium testing supplies to help you out.�

Buying Guide: Best Betta Fish Tanks

Betta fish tanks are designed to provide optimal comfort to a fish of their size and make sure your vibrantly colored pet thrives in its new environment.

Best Products to Remove Aquarium Algae

It's completely natural, but it sure does make your tank look gross! Here are the best products to remove aquarium algae.

Pros and Cons of Feeding Your Fish Live Food

What are you feeding your fish for dinner? If you're planning on feeding your fish live food, here's what you need to know about this type of diet.

The Dish on Discus

Aquariums with discus are visually stunning, but many have stayed away from this fish because of its complicated care. But it's easier than you think!

4 Annoying Pests Found in Your Freshwater Aquarium

Even the smallest pests can mess up the most pristine aquarium. Here are four common (and annoying) pests that could cause problems in your freshwater tank.

Top 8 Best Aquarium Plants for Beginners

Welcome to the wonderful world of planted tanks! If you're just getting started, we've made a list of eight aquarium plants that are great for beginners.

What You Need to Know About C02 for Planted Tanks

Carbon Dioxide is an important element in your planted tank, and your plants need more than you think. Add extra C02 for a thriving aquarium.