Freshwater Species Guides
Whether you're setting up your first aquarium or adding another species to an established tank, these guides cover everything you need — from tank size and water parameters to feeding, tankmates, health, and the equipment required to keep your fish thriving.
Each guide links to the equipment we recommend, making it easy to move from researching a species to building the right setup.
New species guides are added regularly. Start with the species you're keeping or considering, then use the internal links to build out your setup.
Freshwater Fish
Betta Fish Care Guide (2026)
One of the most popular freshwater fish in the world. Striking, personable, and manageable in a solo setup. Covers tank size, water parameters, feeding, tankmates, health, and more.
Goldfish Care Guide (2026)
Among the most widely kept fish in the hobby — and among the most misunderstood. Covers tank size, filtration, water parameters, feeding, common health problems, and lifespan.
Guppy Care Guide (2026)
Hardy, colorful, and one of the best beginner fish available. Covers tank setup, water parameters, feeding, breeding, tankmates, and health.
Neon Tetra Care Guide (2026)
One of the most iconic schooling fish in the freshwater hobby. Covers tank size, schooling requirements, water parameters, feeding, tankmates, and common diseases.
Corydoras Care Guide (2026)
Peaceful, hardy bottom dwellers and one of the most compatible community fish available. Covers substrate requirements, schooling, feeding, tankmates, and health.
Equipment Guides
Looking for equipment instead of a specific fish? Browse our aquarium buying guides below.
New to Freshwater Fish?
If you're not sure which species is right for you, start with one of these — they're the most forgiving for first-time keepers:
- Guppy — hardy, colorful, easy to feed, great for beginners
- Betta Fish — personable and striking, best kept solo
- Corydoras — peaceful, long-lived, excellent community fish
- Neon Tetra — iconic schooling fish, striking in groups