Can your fish live together?

Compatibility data for 500+ freshwater and saltwater species. Built on real fishkeeping experience, not guesswork.

Fish Compatibility Checker

Add fish to your tank and we'll tell you if they can live together.

Your tank is empty. Search for fish above to add them.

Popular Compatibility Checks

Browse Fish by Category

Beginner Friendly

Easy-to-keep species perfect for new aquarists

Community Fish

Peaceful species that get along with most tank mates

Cichlids

From peaceful rams to aggressive African cichlids

Catfish & Bottom Dwellers

Corydoras, plecos, loaches, and more

Tetras & Rasboras

Colorful schooling fish for the mid-level

Shrimp & Snails

Invertebrates for algae control and cleanup

Clownfish & Damsels

Hardy saltwater staples for reef and FOWLR tanks

Tangs & Surgeonfish

Active grazers that keep your reef algae-free

How the Checker Works

Search

Pick Your Fish

Search 500+ freshwater and saltwater species. Add as many as you want to your virtual tank.

Analyze

We Check the Data

Temperature, pH, temperament, adult size, swim level, and species-specific compatibility notes.

Result

See What Works

Clear verdicts for every pair in your tank, plus warnings and tips based on real fishkeeping experience.