Hi Fishfirst, thanks for replying to the message.
I've read in many places about people succesfully keeping Fire-Bellied Newts and Green Anoles in the same cage, sometimes in enclosures even smaller than mine. There is a chance that they might poison each other, but its smaller than you would think, since their skins secrete very similar toxins. Like I said, I'm only going to start with one anole as an experiment. If it isn't going well, I'll remove him right away to a different cage. I'll attempt to make sure nothing as serious as one of the animals dying occurs, but if the anole dies somehow die, I'll try to redeem myself by spreading word that keeping anoles and fire-bellied newts isn't a good idea. With nature there are always acceptions, and nothing's definite. I'm taking a chance, and I don't want the anole or newts to die, but I think that since there's only a small chance of that, I can try it. I'm accomadating all the animals and making sure there's almost no chance of problems (although there always is a problem or two that you don't think of).
As far as the anoles eating the White's Tree Frog, I've read that since the tree frogs are notoriously known for getting fat, the anoles won't attempt to eat them as they are truly pretty big. The anoles probably will leave it alone since they'll sort of be separated, and since the tree frog will look intimidating to them if I get a big one.
Also, I doubt the anoles will try to get to the other side of the tank more than once or twice. If they do get to the other side (which they probably will), then they won't stay long since they'll favor the conditions on their side. That's all if they even get over the big lake in the middle of the tank (although they might be able to climb across the sides of the tank - it might be hard since the air will have a lot of evaporation). As far as getting out of the tank itself, that's a risk whenever you keep anoles, isn't it?
Lastly, although I do expect to find a few bark chips in the water area every other day, I doubt it'll be a problem. I'm going to have slate rocks that will help keep the anoles and tree frog from bringing them over the edge and dropping them into the water. Unless the tree frog orders a dump truck to pick up the bark chips and excavate them into the water section, I'm not too worried.
This is all an experiment. If it goes wrong, I'll remove the animals and just use the tank for simpler set ups. But I have done the research and I think that with a little luck I'll be able to create this tank. If so, it'll be awesome!