it seems like my aro loves to hurt himself and i am not sure how to prevent it.. in order to keep the fish in the tank i utilize egg-crate. to those unfamiliar with what this is - it's basically a plastic grid with 1/4" square holes that is on top of the tank. the aro naturally jumps, and hits this with his face. he's had a few scratches in the past but his most recent injury has left him with a 1/8" gash along the top of his nose area with a small flap of skin, if you will. it's not bleeding or anything and i know it will eventually heal but what do you all do to prevent injuries and keep him safe inside the tank?