I just tried it again for a 45 gallon tank, says the same thing, 4x4 lumber.
Remember if your tank is 48 inches long the plastic frame adds another 1/2 inch so that extra inch gives you a little extra.
FWIW I've got my 90 on a 1x4 frame with a center brace front and back, I built a 2x6 frame for it but I didn't like the height, the 1x4 frame was free so I used that. When I get my large tank... 150-175, I will use 2x4 and 3/4inch ply.
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