Dealing with humidity

[blacknife]

back in january i upgraded to a tank with a sump and moved the tank to the basement. since then my basement has started to smell a little off and the wife always says it feels muggy down there. currently Open top 40b with a 40g sump and a 5g cheato tank. all wedged together near each other, the sump sits behind the stand because its to big to fit in the stand. I also usually have a 33g with fresh/salt water being cleaned with carbon/phosban beside it<no ro unit yet>. it is in the main room of the basement, there is only one small room in the basement that is walled in.

any ideas on reducing the humidity to see if that helps the smell and muggy feeling? the cheaper the better but if it makes the wife happy the $$ might have to be spent.

I would like to upgrade to a bigger tank on a proper sealed in stand at some point but that is not happening soon.