I moved a bin of chewers to a tank and they're first on the list to be culled when I have plenty of breeders.

Unless you line with metal or wire they can't chew, once there's a chewer, it will just chew. Even in the tank, the worst chewer has gnawed the silicone from every inch of the seams and managed to jump up and hang from the edge to chew at the top edge sometimes. She's also the best mom for nursing babies though.

I thought about giving them bones to chew, thinking maybe they need more minerils. I dunno though.