So I recently purchased a coffee table/stand its very sturdy I believe the previous owner used it as a stand before. It was only $35. The told me it measured 5'x18"x21" (LxWxH). It really measures 58"x16"x21". I was planning on putting a tank that's 48" long and 18" wide but now I'm u sure if I should. It would only hang 3/4 of an inch off each side but I would like to get a piece of wood cut to 18" wide to put under the tank to help support it. Is this a good idea? I was thinking about a 80 X-High 48 7/8 x 14 x 30 3/4 but they are hard to come by. What would I do or should I just settle for a 55 ?