kc - I've read of this little trick, and maybe it will spark some ideas if this won't work for you. Some people take a piece of acrylic and make it the height of the tank, then glue the suction cups onto it. The bottom of the acrylic then gets wedged in the sand (obviously will need a substrate for it to work). Have you tried to purchase new suction cups yet? Sometimes new ones are all that is needed.