I don't get it. I take every precaution to ensure that the "jumpers" are contained into the tank...but I have lost two fish since I put the eggcrate top on my tank. THe only holes in the cover are squares I removed in the corners because my lights wont fit on the top if I don't. Where they get through I don't know. I really try to be careful with them so they can't get out. Any one else have this kind of luck. This is two wrasses in 6 months...and both were after the installation of the eggcrate. (And just in case your wondering the squares are very small and the color of the plastic is white).:wall: