Biting the legs and tail is a courting behavior in tegus, males biting the females. It is also a territorial move, with the agressor chasing away the unwanted tegu. At any rate, it sounds as if you may need separate enclosures.
The humidity needs to be addressed. I know it is hard. At least provide a humid hide: damp sphagnum moss on the floor of a hide can increase the humidity.
Laura R (FL)
1.0.0 Colombian Tegu
1.4.0 Argentine B&W Tegu
1.2.0 Red Tegu
1.2.0 B/WxRed Tegu
1.0.0 Green Ameiva (yet another teiid)
7 other lizards
1 little gator
3 FL box turtle
1 Sulcata tortoise
16 snakes
5 fuzzy pets
4 little frogs
a bunch of creepy bugs
and a partridge in a pear tree
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