How to Stock a Peaceful Community Aquarium

A well-planned community tank balances different fish sizes, temperaments, and water levels so every resident can thrive without constant conflict.

Layer Your Water Column

Combine top-dwelling, mid-water, and bottom-dwelling species like corydoras catfish so the whole tank feels active without any single level being overcrowded.

Match Temperaments

Avoid combining notorious fin-nippers like tiger barbs (see our barb care guide) with long-finned, slow-moving fish like bettas or fancy guppies.

Consider Adult Size

A fish that’s peaceful as a juvenile may become territorial or even predatory toward smaller tankmates once fully grown — always research maximum adult size.

Stock Gradually

Add fish in small groups over several weeks rather than all at once, giving your biological filtration time to keep pace and letting you observe compatibility before fully committing to a stocking plan.

Browse our freshwater fish selection to start planning your community.