Fabricating steel stand - which steel do I buy?

[JmeJReefer]

1-1.5" square tube with at least two braces width-wise at the back for support. an open front should be fine. I took a piece of flat bare as well and drilled a hole in the centre of a piece. then welded a Nut on the one side so a bolt could be put through the other repeated for all the legs on the bottoms as a self levelling idea....
A quick emery cloth rubdown and a primer/blackcoat finish did the trick. A rust sealant primer is better....
my two cents...

[jorjef]

I have a 120 sitting on 1.5x1.5x .125w its a very simple design, basically two 4x2 frames one under the tank and one as a base on the floor with the obvious four legs one in each corner. No cross braces or other reinforcement. No deflection that I can see.

[spit.fire]

to bad you're not in bc, i have a stand for that size tank sitting in my garage