I keep all my extra odds & ends in the basement, which isn't finished. My husband got a leftover countertop at work that he turned into a stand for me. It is 6' long and about 2' deep, and very sturdy. Right now it has a 20 gallon long, and a 10 gallon. Works great because it is deep enough to allow me to have some extra space in front when I am working on the tanks. I also have a homeade stand next to it that has a 5.5 gallon and 10 gallon. We've also added some extra shelving to existing stands, to make more room for food, dechlor, etc.
Do you have an extra closet or anything where you can make a rack?