As was said, increase the ventilation to the cage, and/or turn down the current heat source you have and use a ceramic heat emitter or light bulb to heat and suck a little humidity out of the air. Out of curiosity, why is it that you feel you need to reduce the humidity?
1.0 Normal - Maynard
1.0 POG - Victor
0.1 YB - Diana
70% is fine, you don't need to worry about that. Better that you are able to keep it at 70 all the time rather than not being able to get the humidity high enough. The only time you might want to reduce humidity is if you start to see condensation and fogging on the glass or plastic (depends on your setup) of the enclosure. Otherwise, high humidity is fine, if not desirable.
1.0 Normal - Maynard
1.0 POG - Victor
0.1 YB - Diana
Warmer air holds more water vapour than cooler. Glass does NOT absorb water nor does glazed ceramic like a CHE. Humid air rises, CHEs and bulbs are usually vented with screen and allow humidity to rise they tend to also increase ventilation. The question isn't how to lower the RH in the tub but what is the RH in the room? You will not easily be able to drop the RH lower than the rooms RH. 70% is not a problem if coupled with good ventilation. My rule of thumb is with dry substrate and no water bowl the RH should be the same as the room in one hour or less. (one air change per hour).
Smell is a huge over looked sense. If it smells anything other than fresh you need more ventilation and a good cleaning.
lowering RH in the tub (if it is much more than the room) more ventilation remember warm air rises and cool falls, High and low holes will increase air flow much faster than just top. Substrate choice and water bowl size and location also have a huge impact on RH.
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