I am going to be building a stand for my 155g tank (48"x24"x32") and I want to design it so that I can put a 75g tank (48"x18")underneath it to serve as a sump for that tank as well as the 90g tank next to it. But I am a little unsure how to design a stand that is strong enough to support the 155g, but still has the supports far enough apart to slide the 18" wide 75g underneath it. Any ideas? I suppose if I had to I could use my 45g tank as the sump instead, which would only by 12" wide. Would that be better?