Pair check
Check if two fish can live together
Choose two freshwater species from Fishori's 135-species library. The checker returns a conservative GOOD, CAUTION, or RISKY verdict with reasons — so you can decide before the shop bag hits the car. Start with the pickers below; the explainer under the tool stays available if you want the rules spelled out.
How the checker works
- Select Fish A and Fish B — search by common or scientific name.
- Optionally add tank volume in litres if you want volume context with the pair result.
- Read the verdict and reasons, then open the full pair page when you want a deeper breakdown or a shareable link.
What GOOD, CAUTION, and RISKY mean
- GOOD — the pair usually works in a suitable tank when group size and water are handled properly.
- CAUTION — workable only with planning: narrow water overlap, temperament friction, or stocking discipline.
- RISKY — predation, severe aggression, or hard mismatches make this a poor default. Prefer a different mate.
What the checker considers
Adult size and mouth size matter as much as "peaceful" shop labels. A calm cichlid can still eat a tetra; a fin-nipper can shred a betta even when temperatures match. The engine weighs temperament, known nipping or predation, temperature and pH overlap, and species-specific behaviour notes — not vibes from a stock photo.
Results are guidance for planning, not a guarantee about the two fish in a particular shop bag. Read how Fishori evaluates pairs and the limitations before treating any verdict as certainty.
Next steps after a pair check
A pair verdict is not a whole-tank plan. When you are ready to test volume, group counts, and multi-species conflicts together, use the tank builder.