building tank stand questions.

[Abbyreefer]

I'm in the process of building a stand for my new 65 gal tank (36x18x24 high) and was going to build the tank 40" so I can have a bit extra room for a fuge in there sump willl tank up 24" and then fuge 12" with some room then for wires and what not.

Anyways my question is if I build the tank with 2x6's would I need a center brace ? I'm trying to see if there is any way that I can keep the whole middle area open but if everyone things its needed then I can always use 2x4's and put one in the center front and back.

Any advise is greatly appreciated.

Cheers !