I have a 55 gallon tote that is pretty tall, if ive got mice in it do i really need a lid? I know for a fact nothing will be able to get in( because of where i keep them) or be able to tip it over or have the mice jump out.

It would help me air out the tank and would be less work for me( not that its hard to open a lid, its just where i have them it could be a hazard!)