Tom, you stated: "3/4" plywood shelving should be used in place of the 1/2" particle board that comes with the units. ". While I use and love the Gorilla Rack (purchased at the same store), why change the wood? I have had no problems and as you have stated the tank extends over the metal frame anyway. Clint Venable Alta Loma, CA --------------- See http://www.aka.org/AKA/subkillietalk.html to unsubscribe