Put me second in line for the 15G! I really like these long and shallow tanks.
Anyway, I found my solution in this thread: http://www.aquaticplantcentral.com/forumapc/aquascaping/27772-high-rise-aquascape-3-tank-rack.html">http://www.aquaticplantcentral.com/forumapc/aquascaping/27772-high-rise-aquascape-3-tank-rack.html</a>
Basically, he got a commercial grade wire rack that exactly looks like mine but is a lil bigger and has 500 lbs shelf capacity. He reinforced it with 2x4 plywood. To borrow his ideas, I will get a tall one just like his and put my tank on the second shelf and hang the 20" MH from the top shelf like a pendent to reduce heat. What a perfect solution - it kills several birds with one stone.
Anyway, I found my solution in this thread: http://www.aquaticplantcentral.com/forumapc/aquascaping/27772-high-rise-aquascape-3-tank-rack.html">http://www.aquaticplantcentral.com/forumapc/aquascaping/27772-high-rise-aquascape-3-tank-rack.html</a>
Basically, he got a commercial grade wire rack that exactly looks like mine but is a lil bigger and has 500 lbs shelf capacity. He reinforced it with 2x4 plywood. To borrow his ideas, I will get a tall one just like his and put my tank on the second shelf and hang the 20" MH from the top shelf like a pendent to reduce heat. What a perfect solution - it kills several birds with one stone.