What it checks
TankMate weighs the four things that decide whether a new fish thrives or causes chaos: adult size, water type and parameters, temperament, and your existing livestock. Not a generic care sheet — your tank.
Will these fish get along?
That's the question the scanner answers before you spend a dollar. It flags aggression, predation, and adult-size mismatches that a tiny juvenile in a store tank hides completely.
Real examples it catches
- A cute juvenile lionfish that will eat your small tankmates once it grows.
- A second male betta that can't share a tank with the one you have.
- Caridina and Neocaridina shrimp that want different water and shouldn't mix.
- A fish that needs far more gallons than your tank will ever hold.
Backed by a real compatibility engine
The warnings are deterministic and hobby-accurate — built on real fishkeeping rules, not vibes — so the answer you get at the store is one you can trust.