I have a clean 80mm f1.9 on the way for my Mamiya 645. The only concern is that when I purchased the body a week ago there was some small fungus growth on the mirror. I gently cleaned what I could see off and probably added some scratches in the process (In my opinion a fair trade off). I am going to leave the body in the sun for two days then store my equipment in a dry box with silica gel packs. Are there any more preventions I can take to make sure my new lens stays fungus free?