My Puffers: Puffers I have kept: T lineatus T miurus A modestus T biocellatus C valentini C coranata C papuan C lorteti DPs suvattii burrfish T niphobles
I was wondering the same thing, I think emerald crabs are pretty, and they are reported to eat bubble algae, and I hate bubble algae with an unatural skin crawling passion.
Are they mean?
When they're small they're fine. As they grow they can become territorial and go after fish that bother them. They can also become eaters of soft coral. This thread highlights some of the downsides of the Emerald Crab.