I've had two chewouts out of 17 of those tubs over a year. Those rats should be culled, because it's something they'll never forget how to do and will teach the other rats in the tub with them to do. If you have a watering system, they can chew it to pieces when they get out, so even if they get back into the tub after they're done roaming it can still cause problems.
Giving them wood blocks to chew is good advice.
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