For those of you looking for ways to control the humidity with your film storage, this just might be the ticket until you figure out a permanent solution. Put your rolls of film in those cardboard tubes and then insert one of these in each tube:
These are made to control humidity to a certain percentage as marked on the package. The ones I have in the link are for 49% humidity. If it gets too dry, they add moisture. Gets too humid, they take moisture out of the air. Once they get rock hard, throw them out and replace it.