I've been going around to all of the LFS's around here and I ask if they are able to order in a wimple piranha. None of them have even heard of this fish and the only response that I get because of the word 'piranha' is "yeah, they're probably illegal in this state" (FL). I try to explain to them that they're not real piranhas but they're not listening!
They eat only scales off of other fish from what I understand, so, do they get all of their nutrients from the scales alone? If so, could anyone explain to me how that is possible?