Really, the plywood doesnt support any tank weight in the middle. The glass has enough strength to be supported on the edges only. Thats how tanks with trim are. The trim holds the tank off the stand. But, I would use no thinner than 1/2". The foam, 1" should be fine. I'm using 5/8" ply and 1" pink foam under my 150g.
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Dan Pesonen
Umm, a tank or 5
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