Question regarding strength of a steel stand

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Firstly I have no idea if this question is in the right place, if not moving it would be greatly appreciated. I am wanting to construct a stand for an aquarium build I am working on. The stand will be 3'3" High X 2'1" Wide X 2'1" Deep. I would like to use 1.5" squared steel tube, and all pieces will be welded together. The aquariuim and everything in it should not weigh more than 600lbs and that is being generous. My question is would a 11GA (.120 wall) of the tube be thick enough to support this weight? I have attached a rough drawing of what I want it to look like.

[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1359&stc=1[/IMG] The bar going across the width and depth of the stand will be on all 4 sides and hold a shelf.

If yall need more info let me know and I will get it ASAP

Welcome to the forum.

Thanks for providing an adequate drawing.

What is the precise size / shape of the aquarium itself?
(I'm thinking about mounting / COG issues.)

The aquarium is 18"H X 24" D X 24" L. There will be a piece of 1/2in acrylic laying over the top with the aquarium on it. It is a cube.