Tank mate checker
Add the fish you keep or plan to buy. Every pair is checked against 99 species, and each cell links to the reason.
Add two or more fish to see the result.
Reading the result
Green means the pair shares water conditions and neither is a threat to the other. Amber means it can work, with a condition: a bigger tank, more plants, separate feeding. Red is a hard no.
A tank is only as safe as its worst pair. One red cell is enough to rethink the plan. How each check works.