Hello ! To prevent mold then you need to control your relative humidity level and keep it low and to have a good airflow around your buds. If you want something against the fungus then Difenoconazole is labelled as an anti-fungus so you can go with it but be easy on the dosage because this kind of chemicals can remain long time on your plants and in your soil , so use it soon if you don't want to smoke it. I hope it will help you ๐๐