OK I bought a DVD on making a tank. The sound is not so hot so I am having trouble figuring out my parts list. It is all written on a white board behind the guy, but it is never shown clearly. Has anyone figured out exactly what they need? One of the things is a large piece of floral foam, but I cannot find anyplace to buy it in the required large size. Anyone have suggestions? I am going to attempt to build one myself. If it turns out well I will start making them.