OG KUSH and SOUR DIESEL MOLD. TOO COLD IN MY BOX. HELP ME PLEASE COMMENT

I'm in the 3rd week of flowering and my plants have slowly been showing signs of mold. I have 2 WHITE RUSSIAN plants, and 1 OG KUSH and 1 SOUR DIESEL, and ONLY the OG and SOUR DIESEL have the mold. A friend mentioned to me that my temp. dropping to low at night could cause this. I live in the desert and it gets REALLY cold at night, and its suppose to be almost summer. It gets about 60F possible lower, and i usually keep it about 78-82F in the day. I'm having round spotted mold on portions pf ONLY THE WATER LEAFS. I have been wipping them down with neem oil and making sure to not get it on my buds, but it still is coming back. Is my ONLY hope to raise the TEMPS during the night when its sleeping?

PLEASE COMMENT

i'm confused you said REALLY cold and then described it at 60f, thats a nice night for me, anyways the mold likes warmer weather not cold, the cold would actually help, if it was cold. but 78 in the day and 60 at night IS perfect for mold formation, is it powder, black, mottled?
hopefully just powder.

its hard to see them, but the faint white round spots on the water leafs.

its just powder. its possible that it gets close to 50F at night too

What kind of air circulation do the plants have? Those temps are almost exactly what I used to grow in, during the colder months, and I never had a problem. So, I'd say that it's likely they need some oscillating fans blowing steadily, or, larger fans that you are using now. Insufficient air circulation is a major cause of molds, fungus, etc.....

I wish I could help with a cure, but, my rooms are always in a constant 'tornado environment',LOL so, i have never dealt with mold/fungus issues.