I had a midas blenny in with my diamond gobie and they never bothered each other at all.....the diamond gobie hangs around the bottom and the midas blenny's home was a hole in the rock near the top........Though I will never be sure what caused the midas to decide to jump the day he did.....clear through the holes in the egg crate and out into the middle of the living room floor.......a very sad day as he was one of my favourite fish.....