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Unread 11/07/2018, 05:02 PM   #8
davocean
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Join Date: Nov 2005
Location: San Diego, CA
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What the manufacturer is saying is don't do what some people have done and put too thick of foam sheeting that actually pushes on tank bottom, or does not allow it to sit as designed.
Personally I always build w/ a ply subtop for every tank, a trimmed tank just will not touch it, but a ply sub top adds a great deal of strength and rides minor deviations that typically come on a dimensional lumber frame.
Any glass flex is very slight, it will not touch ply bottom


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