I thought I heard this was a good idea once and have had my 10 gallon sitting on a piece. Now I just got a 50 gallon and built a stand with a plywood top (even though I guess a top isn't even needed since all the weight is distributed on the edges and some stands don't even come with tops). But anyways, I have a big sheet of 3/4 inch sytrofoam laying around. Would it be a good idea to put that between the tank and the stand? Or a piece of cardboard?