Maybe try screwing one of these on the corner?

http://www.lowes.com/pd_67407-1277-M...ace&facetInfo=


Though that won't stop them from chewing the rest of the tub.


Do they have anything to chew on? I provide wood blocks for all my rats and paper towels to shred. Keeping them busy is a lot better than them sitting in a box with nothing to do but chew the sides off.

None of my rats have ever showed any desire to chew on the plastic.