Coralkinhonest saltwater & reef care

Free tool

Saltwater fish compatibility checker

"Will these get along?" Tick the fish you're considering — we check every pair for the clashes that actually matter: two tangs, mixed clownfish, aggressor-vs-timid, and tank size — straight from our fact-checked care guides. Check before you buy, not after.

Pick the fish you want to keep together

Only fish with a fact-checked Coralkin care guide appear here — more as we source them.

Guidance, not a guarantee. Fish are individuals — temperament varies, and even a "yes" needs the right tank size, groups and cover. These checks come from ourfact-checked care guides; read each fish's full guide too, and always have a plan to separate a fish if it doesn't work out. Size the tank with thecleanup-crew and chemistry tools once your list is set.

How this works

Every fish's temperament, minimum tank size and own-kind rule comes straight from itsCoralkin care guide, so the checker can never contradict the full guide. It flags the big, well-established conflicts (one-tang-per-tank, don't-mix-clownfish, semi-aggressive fish harassing timid ones, and fish that need a bigger tank than you have) — it doesn't try to predict every individual personality. When in doubt, add the calmer fish first and the pushier fish last.

A free Coralkin tool — no sign-up, nothing saved. It reasons only over facts we've sourced and cited. We never guess a care number.

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