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Freshwater Fish: The Ultimate Guide to Species, Care & Tank Setup

Best Freshwater Aquarium Fish

Written by

Mark Valderrama

in

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Freshwater aquarium fish offer an incredible diversity of colors, shapes, behaviors, and personalities. Whether you’re setting up your very first tank or you’re a seasoned aquarist building a complex community, there’s a freshwater species perfect for you.

This mega guide is your central hub for everything freshwater fish. We’ve organized our 200+ in-depth articles into species groups so you can quickly find care guides, tank mate recommendations, and expert tips for any freshwater fish. Each section links to our detailed articles where you can dive deeper.

Table of Contents

Getting Started with Freshwater Fish

New to the hobby? Start here. These guides cover the best beginner-friendly species, community tank stocking, and how to choose the right fish for your tank size.

Best Fish by Tank Size

Cichlids

Cichlids are among the most colorful and personality-rich freshwater fish. From the vibrant African cichlids of Lake Malawi to the majestic South American species, this family offers something for every experience level.

African Cichlids

South American & Central American Cichlids

Dwarf Cichlids

Goldfish

Goldfish are one of the most iconic and beloved freshwater fish. From fancy varieties to hardy comets, they come in a stunning range of shapes and colors. Proper goldfish care starts with understanding their unique needs.

Goldfish Varieties

Tetras

Tetras are the backbone of countless community tanks. These small, colorful schooling fish are peaceful and look stunning in planted aquariums. Here are our guides to the most popular species.

Livebearers

Livebearers are beginner-friendly fish that give birth to free-swimming fry instead of laying eggs. Guppies, mollies, platies, and swordtails are the most popular species in this group.

Gouramis

Gouramis are labyrinth fish known for their vibrant colors and unique ability to breathe atmospheric air. They range from peaceful dwarf varieties to more assertive species, making great centerpiece fish.

Barbs

Barbs are active, hardy schooling fish that bring energy and movement to any tank. From the popular tiger barb to the peaceful cherry barb, this group includes species for every community setup.

Catfish & Plecos

Catfish and plecos are the workhorses of the freshwater tank. Many species help control algae while adding interesting bottom-dwelling behavior. From tiny otos to impressive plecos, there’s a catfish for every setup.

Loaches

Loaches are fascinating bottom-dwellers known for their unique behaviors and ability to control pest snails. Many species are social and should be kept in groups.

Rasboras & Danios

Rasboras and danios are small, peaceful schooling fish perfect for nano tanks and community setups. Many species display stunning colors and are incredibly hardy.

Angelfish

Freshwater angelfish are elegant, graceful fish that serve as stunning centerpieces in medium to large tanks. Their tall body shape and flowing fins make them unmistakable.

Killifish & Rainbow Fish

Killifish and rainbow fish are some of the most brilliantly colored freshwater species available. Often overlooked by beginners, these fish reward experienced keepers with dazzling displays.

Large & Exotic Species

For aquarists ready for a challenge, these large and exotic freshwater species offer truly unique fishkeeping experiences. Many require spacious tanks and specialized care.

Sharks & Large Fish

Oddball & Specialty Fish

Nano & Micro Specialty Species

Freshwater Invertebrates

Freshwater invertebrates add diversity and utility to your tank. Shrimp help with algae control, snails clean up waste, and crabs bring unique personality. Many make excellent additions to community and planted tanks.

Shrimp

Snails

Crabs & Crayfish

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