I would use 2x6 for the long cross rails and 4x4 for the legs. As some one stated above there will be alot of weight on this, so do lots of research and show a more detailed design.
A couple of things, the top of your upper tank will be over 6 feet high(maintainance nightmare). Where are you planning to put all the filtration for this massive amount of water?
A couple of things, the top of your upper tank will be over 6 feet high(maintainance nightmare). Where are you planning to put all the filtration for this massive amount of water?
