Humidity problems for large tank

[Snappy]

I never had a humidity problem before, but now since I added another 50 gal of open water and another 250 watt light 2 weeks ago, together with the heatwave we are having it has gotten really bad. I have now put fans in the basement windows to blow out as much of the wet air as I can, but yikes it is worse than I ever imagined. I think this thread put a curse on me.