Get a dry cabinet... small one will do if you don't have a lot of equipment. Save you the hassle of replacing the drying agent, and it can be turned on all the time. Also, allows you to adjust humidity... personally, I think 45% is just nice.
Probably the cause why the humidity is low because i replaced the original silica gel with the gel from dehumidifier. Just read from other forum that using dehumidifier is not advisable. Planning to buy a silica gel on monday or tueday. Thanks so much.