They will chew. Doesn't matter how many toys you give them, they will start to chew the tub eventually. I use clear rubbermaid tubs that don't have much of a groove. the only chewing they do is the hole around where the water bottle comes in and they bite the edges of the lid where the mesh is.

Oh and the babies can squeeze through 1/2" hardware clothe, so beware!

Overall, ASFs are a pleasure to keep, but don't expect them to sit in your hand like pets once they start having litters. They are quite protective. I just let my ASFs do their thing and only bother them to steal babies or clean.