Mine have wheels, chew huts, wood sticks etc.. They didnt chew for months. I thought I had some non chewing ASF's. Well, all of a sudden they chew! I moved some into aquariums due to the chewing. I made the mistake of getting plastic water bottles and put them into the metal water bottle guards. Didnt work. Those little buggers chewed holes in the top edge of the bottle since they couldn't get to it from the bottom. Water bottle do not work if they have a even the tiniest hols in the top. No vacuume. So just keep an eye on them in those plastic tubs. If they ever get bored they will find something to chew.
You can use a glue gun to seal the hole that they chew at the top.