I keep my savanna monitor in a 125 gallon aquarium. She's just under 3 feet long from nose to tail tip, and fits in there perfectly.
She has a hide and a very large water dish. The dishes are the second hardest thing about savannas, they will poop in their water dishes every time. And it has to be large enough that they can lay their entire body in it, so it's irritating to change, but it's for the animal, and it's happiness.
The hardest part is the humidity. Just can't seem to keep that right here, I think I need to get a more solid top for the cage, and not the mesh one I have on it now.
