Building a stand for PVC bottom tank?

[kpk]

I am fixing to build a stand for my tank that is on order. I'm going to build it with 2x4s like in the thread here on RCA. Just had a few questions though.

Can I build it w/o any cross braces in the top and bottom as long as I screw plywood on the top and bottom? I had a oceanic stand under my 220 that only had a 3/4" piece of plywood and no cross braces like I described.

Also, being that it's PVC, does the entire bottom of the tank have to have support or would it be sufficient to have support around the edges only? If not how about around the edges and every 6 or 8"? What I have in my mind is using marble for under 2"-3" around the edges and hanging out from the bottom of the tank another 3" or so.

Ill see if I can draw a picture as well.

[mc-cro]

my 160g A.G.E tank has a pvc bottom, and is sitting on the stand they built.

my stand is a 1" square tube frame, it does have 1 centerbrace across the top. with a 3/4" plywood top. perfectly flat in every direction.

[dustinc]

My tank has a PVC bottom and I was told by the manufacturer to have a plywood top. I would talk to the manufacturer and get their recommendation.