I like the 30x30x45. Its a nice home for a whites tree frog if you want more whites tree frogs down the road, which you will. Because i know you don't have to buy any more tanks for now. That size should keep you busy for a while . I also like the Douglas fir bark for substrate. It's also nice to put some driftwood in the tank ,so they rest on . I also put a nice size water bowl for them to relax. Make shore its not too deep ,so they don't drown. Good luck with your project. Btw check out the care sheets on this site. LOL