is it a concreat wall or is there some wood you could drill through?
best bet would be to drill a 4 or 6" hole and then get a good fan which will be hooked up to a humidistat. but seeing as you are doing a rock enviorment use just NO lighting and put a glass top on the tank to reduce evaporation. if you have a problem after that then you can look at ventalation or a dehumidifyer.
Steve
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