Right now I'm in the planning stage for a plywood tank. It will be a while before I build it. I'm curious in that do I have to use fiberglass to strengthen the tank up, or could I use other materials. Would it be possible to build a frame of wood around the outside of the tank to reinforce it? The size that I'm thinking of for the tank would be 4' by 2' by 2' tall. Thanks to anyone who helps me out with my question. As I said before, it will be quite a while before I start the build.