You'll love having them around. Mine have been in tubs like this for over two years with no problems. They generally won't chew the tub if they have a wheel and rodent chew logs/caves.
I also supplement mine with dried meal worms now. They love them!!! I found a huge bag in the bird seed section at a local Big R store. Which is just like Farm and Fleet.
They also love dubia roaches.
These are regular Norway rats but my ASF are in the same thing.
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Snakes, Jeeps, Dragons, Nature, & Knives.. Makes my world go-round!