How do I know what fish fits together?
There's no single rule — "fits together" is really about eight or nine different questions at once, and most fish-compatibility mistakes come from checking one of them (usually temperament) and assuming the rest line up. ReefPicker runs all of them together, against the fish you're actually planning to keep.
How do I know what fish fits together?
ReefPicker checks each pair of fish across several dimensions at once: does your tank have room for both (size and swim length), will one bully or eat the other, can you keep two of the same or similar species together, does either need to be kept in a group, is either fish safe around your corals and inverts, will they compete over territory, and whether adding them pushes your tank's total bioload too high. A pair can look fine on temperament alone and still fail on territory or reef-safety — that's why it's checked as a set, not one rule at a time.
Does compatibility depend on my specific tank?
Yes — size and bioload verdicts scale with your tank's actual volume, not a generic rule of thumb. A pairing that's fine in a 300 L tank can be a real conflict in a 60 L one. The species pages on ReefPicker show a neutral, roomy-tank verdict as a baseline; use the Livestock Checker to see it checked against your own tank.
What does ReefPicker NOT check yet?
Temperature compatibility between species isn't built yet — every species on ReefPicker today is a standard tropical reef temperature range, so it isn't currently a source of mismatches, but it's not an active check either. Everything else on this page is live.