There's a product called "Reflectix" (or something like that) that you can buy at any hardware store. It's inexpensive. It's an insulated padding covered with some sort of aluminum shell. Very flexible and easy to cut to size. I used to use it to cover the bottom of my tub that had a flexwatt UTH attached to it. The Reflectix reflected the heat back up and helped spread it more eavenly across the whole bottom of the tub, but still left a warmer spot where it was supposed to. I wrapped the Reflectix around two sides of the tub and left the ends unwrapped and open to allow for some air to flow around the heat source.
Even so....it's usually very difficult to properly heat a glass aquarium with just a UTH, no matter how effeciently the bottom is covered. What is the rest of your set-up like. Do you have the sides insulated? Do you use any sort of overhead heating? What are the ambient temps in the room and do they fluctuate much?
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