Personally, I use UTH & I use weatherstripping on the bottom of all my tanks. It's easy to snip a few gaps in it for wires, AND it keeps your tank from slipping around if you bump it or happen to have an earthquake*. (*been there) It's sold in most hardware & home improvement stores, in a flat spiral & is peel & stick on one side- nothing easier to use. You want the closed-cell-foam type- the open-cell squishes down too easily. This also insulates- ie. helps keep the warmth provided by the UTH under the tank where you want it. But DO snip a few gaps, both so the tank doesn't sit on any wires, but also for proper UTH installation safety.
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