That is already accounted for. It's the reason i made the tape walls. These have held extremely tight. The egg crate is nothing more than the frame really. Not even my wrasse can escape this I didn't tape it 100% coverage but did enough so that what was left was too small for any fish to get through. I didn't tape the corners, but on the other side there are the corner supports - it would be rather difficult for a fish to get through that maze... nothing stopping you from taping all the way either. Do not, however, tape all the way to the bottom of the egg crate as you don't want the salt creep getting into the sticky.