Well, I got my tank today!!!! It's a 125 gallon with two MegaFlow overflows. Anyway, the shelf for it is being built tomorrow. I'm a little worried about the shelf not being perfectly level but I recall some people on here said they use foam under the aquarium. I have a big piece of carpet padding that's a half inch thick and was wondering if it would be acceptable to use. If it's not what type of foam can be used?