x2 Ball pythons should never be housed together... and a 100 gallon tank is not the best idea either.
For the cost of 100 gallon tank you can get PVC cage that is designed for reptiles (vs a tank made for fish)
http://ball-pythons.net/forums/showt...With-Pictures!
Check out these threads as well:
http://ball-pythons.net/forums/showt...ius)-Caresheet
http://ball-pythons.net/forums/showt...04#post1845904
As for what to put in a cage this is what I have found to work best:
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