I have 1 female marijuana plant that has been growing for about 3 1/2-4 months. I have her under about 5000+ lumens and I water every 2-3 days or when the soil feels dry. She is growing beautifully. She has many places where white hairs are sticking out, and she smells great. But just a couple of days ago I noticed some mold growing on the soil around the plant, no mold on the plant though. So I removed most of the mold and put a fan in so that it would circulate the air. But today I noticed it started to come back and I again removed it. I need to know what is causing this so I can fix it, or is there anything that I can spray on it to kill the mold. Please Help!!