Thanks Lynn, good idea No haven't tried anything yet (only just read the response this morning that humidity needed to be <70%). Was hoping to find a method that wouldn't need electricity but a fan might be my best option I guess. I just found these "moisture absorber packets" on ebay:
1x 100 gm Silica Gel Desiccant Moisture Absorber dehumidifier dessicant desicant | eBay
They're non-toxic silica gel that absorb moisture from the air without creating biproducts and to reuse them you just dry them out in the sun or the oven... Might give them a go and see how I go. Might still get a fan eventually anyway since its probably a good idea to get some air circulation in there...