Originally Posted by Tobykourtney
Not any particular reason other then peace of mind. 4 ft for me is alot of room for sag. I typically look at commercially made stands as a base line for what I can get away with because I doubt they would waste money on a center brace if it wasn't Neeeded.
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Peace of mind is always a good thing
, however with 4' (especially with 2x4 bracing, but even with plywood) you won't get any sag. If you look at commercial stands, none of the four foot stands have an actual center brace. The stands for a 55 gallon are either open in the middle or contain a single door in the center and are built out of 1/2" pressboard. 2x4s alone are way overkill for this size tank.