Double stand for a 5' 100 gallon tank.

[Knowdafish]

I went to price the lumber, but they only carry class/category 2 lumber. It isn't very nice looking. I know that I can use 2 x 4s for just one tank, but spanning 5' with a single 2x4 worries me a bit on the front. I'm thinking that I may try and use 2x6s. Not sure though. I really suck at DIY.

Double up the 2 x 4's front and back if you don't want to use 2 x 6's. If you do that and run one single 2 x 4 down the middle and use 3/4" plywood on top and a plywood back to keep it from racking it would be bullet proof!