I had a bi-color blenny in my 28G JBJ Nano, but had to get rid of it because he liked to nip at my SPS corals. When I sold him back to be
LFS (half the price
) the corals started to open again and have been doing fine ever since.
From what I have read almost any fish you buy can nip or eat your corals except maybe Tangs, but don't quote me on that. Blenny's are no different. It could have something to do with hiding places and territories.
