Awhile back I got a 20-gal long tank, which was 30" long x 12" deep. I have a Penguin HOB filter that needs about 3" clearance. All the stands I found seemed to fit the tanks exactly without leaving any room for the filter. I didn't want a big gap between the wall and stand because it was in my living room, so I ended up getting a stand that was really made for a larger tank. Almost all stands have open backs for accessing equipment, so why aren't they made where you can put them next to the wall and still use a filter on the back?