what can i breed in a 100gal?

[herp_collector]

I have acquired a 100 gallon tank and I want to keep something nice looking, big and nocturnal in it, not necessarily in that order. It is made from repti-glass so I can't keep anything that requires more than I'd say 3 inches of water. The dimensions are: 20" tall X 22.5" wide X 52" long. I have beardies, leos and tokays so I would like something bigger like maybe some kind of small monitor or something. Anything that doesn't need a UVB bulb is preferable but if it is really cool or whatever I will think about it, so any offers or suggestions are great. I don't have much money so anything over like $500 is completely out of the question and anything above $200 will not be bought for a while but I would really love any suggestions. Thank you, Morgan.