humidity can easily be controlled by a hide box (which u should always have when using an aquarium) and a correctly placed water dish. humidity is going to excape no matter what heat source you use in an aquarium. I also suggest covering 50% of the top with either a peice of wood or a sheet of metal cut to size if you have access to it.
You can use the UTH with a thermostat. this is a great option. I just prefer using lamps for aquarium heating. Also for heat during the day, a standard incadescent bulb is all you need, and u can get a pack of 4-6 for a couple bucks. if your night time temperatures drop to low and u need a red zoo med light, those are more expensive, around $12.
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