Nicki, I just wanted to give u a heads up. I learned the hard way when I added a log to my boys house,which he loves by the way, that those holes like in your castle can be very sharp. He scratched a bunch of scales off the top of his head because some of those holes are not to big and they can get hurt. So I took mine out and used an emery board to file them smooth and now no sharp edges and a healing fish. Only thought I would mention it as your castle thing has some smaller entrances that he might get hurt on. God luck