Fish Compatibility Checker
Check whether two aquarium fish are generally compatible.
Quick answer: enter your details below and click Check Compatibility — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Pick the first fish.
- Pick the second fish.
- Click Check Compatibility.
About this tool
Pick two fish from the built-in list and the tool reports whether they are generally compatible, cautious, or best avoided together. This is a general guide, not expert advice, since tank size, numbers, and individual temperament change real outcomes.
Frequently asked questions
Is this expert advice?
No. It is a general guide from a small built-in list. Species research matters more.
Does tank size change compatibility?
Yes. A larger, well-planted tank with hiding places reduces conflict, while a small bare tank worsens it.