Review on 12-Piece Plastic Egg Crate Aquarium Fish Tank Divider – Bottom Tray Grid Isolation Board Partition Net Pane Separator for Mixed Breeding, Light Diffuser – Includes 15 Sucker Clips Suction Cups – Black by Sarah Smith

I have a blue crab that started fishing in the tank so I ordered it. A lot more pieces than I need but now I have a nice little cage in the tank to protect the fish from crabs. The boy knew exactly what it was and it took me a week to catch him under the cage. (Maybe it helped that he just shed the same day I was able to catch him.) Works great! The fish are happy and safe and the crabs can't get to them. Food also gets into the cage without any problems. Crawdad will have to live with it!