Tank compatibility checker
Add the fish you have or plan to buy. We check whether they can share water and each other’s company, and whether your tank and group sizes meet each species’ minimum.
1. Tank size
2. Your fish
Add your first species below.
Water they all like
Temperature—
pH—
Conflicts found (0)
What this checker does and doesn’t check
Checks
- A temperature and pH range all your fish share
- Tank mate conflicts between every pair (fins, size, temperament, water hardness)
- Each species’ minimum tank size, and pairs that need more room together
- Minimum group sizes for schooling species
Doesn’t check (yet)
- Total stocking. It won’t tell you a tank is overcrowded. Fifty fish that each fit a 10-gallon tank don’t fit one together.
- Filtration, tank shape, plants and decor
- Your own water: test it, and compare with each species’ page
It covers 11 species today. Use it to rule combinations out, not to prove a tank is safe.