One cause of mold is high humidity in your room. A sulfur vaporizer is one way to deal with mold. The sulfur burns slowly in the pot and fills the room and kills mold.
Watching your humidity is the safest way, but for every take there needs to be a give too. Higher humidity and the plants grow faster and larger but you have a problem with mold. Just be prepared next time. Monitor your Humidity all the time's and very it with the growth cycle for best results. The later into flowering the lower you need to keep your humidity.
You can't smoke that moldy bud it can kill you.
If you go cheap you grow cheap. - Me