There are few important things with chewer
You need to make sure that if you are using a rack there is not gap that they can use to start chewing their way out, same applies for groves and ridges.
Sterilite tubs have groves and ridges and I would recommend using IRIS if you want to go that route or build a rack with concrete mixing tubs.
Finally any chewer or any animal in a tub that has been chews MUST be euthanized, a rat that knows he can chew his way out, will keep chewing, worse yet he will tech any rat place with him to do the same.
When it comes to chewing you need to have a zero tolerance policy.
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