I'd love to keep a piano blenny! They're quite prolific down here as well. My question is, how much damage can they really do to other fish? Surely they're not gonna take chunks out of the side of my fish? Would the small wounds that it inflicts get infected? Or will it just keep nailing the same spot until serious injury results?
Bear in mind that the smallest fish I have is a pair of 8cm squirrel fish.