Basements have usually more humidity to begin with which should reduce your evaporation, is there an unusual amount of surface disruption, or anything else that would cause such an evaporative effect.
If not and it is possible you could install a bathroom fan near the tank and have it kick on when the light are on to help dry out the basement. I got mine for under $40 at HD and it is near silent.
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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