My Iguana Cage That I Built

This is my cage that I've been working on for a while now. It is 4 feet tall, 4 feet wide and 2 1/2 feet deep. Right now, it only holds one green iguana. I'm not completely done with it yet. I'll be adding a waterfall that flows over rocks on the far right side. The bottom is just regular glass and above that is a screen to let some air in. I will be adding a shingled roof that I already have made that I will be putting on soon.

I would love to add a couple more animals since the cage is so big, but I don't know which kinds. Any suggestions??? Thanks!