You are correct- ASF's are notorious for chewing.  I initially had my ASF's in a 20g long glass enclosure with a screen top.  They quickly figured out how to climb up the water bottle and started gnawing at the screening at the top and made an effort to escape.  I used glass water bottles, so while they could not chew the water bottle, they did manage to climb the metal holder that hung over the cage.

Another problem with glass caging is that often their lab blocks are placed inside the enclosure with the ASF's.  They will gnaw on their lab blocks just for the sake of chewing.  It is wasteful and creates a powdery mess at the bottom of the cage.  Of course, ASF's like to chew on fingers too. ;)

I try to keep them busy with adding a toilet paper tube into their tub.  My tubs are not large enough, but if you choose to keep them in a glass enclosure ASF's love to run on wheels.

Now I keep my ASF's in a small ARS caging system similar to this: http://www.arscaging.com/ars1050.html  So far, they have not been able to chew through the tubs or the wire top- and they do bite at it frequently.

Good luck.  I enjoy having my ASF's.

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