I would build up some sande towards the back, kinda like a hill, so he can breathe more readily. Very nice looking set up though, I like the way it looks a lot.
too bad about the devils... but pretty much any one of us could have told you it wouldnt work. Im surprised it didnt come to blows sooner, It was sure a cool setup though
Nice new home for the turtle, but I would put a shelf in there asap.