I have a small area to work with and need to stack two small tank for breeding. I only have 2x2' area to work with.... Should i go with 2x4" or weld up a small frame to same room? If i go with 2x4" that means i lose a few inch but if i attach a frame i can get 2x2' tank .... anyone got any small tank stack plants out there? and how much will a 2x2x2 or close will weight?