i had a 3x2x2 tank on a metal frame. I ended up going with a double layer of 3/4" then 1/2" foam. probably a bit over kill but I wanted to lift the tank a little higher.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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