The foam allows for any slight uneveness of the stand. It will crush slightly at any high spots ensuring the tank is supported evenly across the base. Of course you still need to make sure it is fairly flat and level, the foam can only do so much. I use a piece of 1/2" extruded foam insulation (the pink or blue stuff) under all my tanks.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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