I manage a
LFS in Baton Rouge. We build all of our tank racks out of 2x4s and use 2 1/2 inch deck screws to hold them together. We build a frame 1/4 an inch larger then the tank. In this rim we add at least two additional supports for mounting lights later. The vertical pieces are four 2x4s cut to height. I use at least three screws to hold each upright to the frames.