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Originally Posted by TheReefGeek
Yes it does, how much depends on whether your tank supports everywhere, or just on the edges.
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By my math, 4000 lbs over 24 sqft = 167lbs/sqft. I just tested a piece of that foam and I don't get any compression when I put all my 140lbs onto an area of only 6" square. My guess is that it isn't going to compress at all.