I second the bulldog binder clips.
It is easy to heat tubs. I use a 35 watt halogen spotlight on a dimmer pointed at the tub. The light in about 20 inches away. I have a black top, so the light doesn't bother the snake. Radiant temps hit 87.
I also have an aquarium heater set to 89 in a rubber maid container filled with water to proved belly heat. I provides even heat, has thermal mass to keep the tank stable, and can't burn the snake. On top of the substrate temps hit 82-84 with just this heater. To make the heater, I cut a slit in the rubber top with a razor blade knife, then cut a hole big enough for the chord at the end of the slit. I pushed the cord through the slit into the hole and used silicone to seal the slit and hole. Then I fill the container with water, set the heater 89 and put the lid on. Instant safe UTH. If you want to add humidity, a few small drill holes in the lid can raise humidity by ten or so percent. I change the water in the rubbermaid once a week.
David
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