Will high rh during night cause mold?

my grow box is 2x4x4. Only running 7 cfl lights. I'm starting week 8 of flowering. I was battling high rh during the day. So I ran some duct work from my ac unit and put it right in front of my air intake. So day time I'm running 40%to 45% rh, sometimes it dips to 35%,temps at 75 to 77. Now my problem is at night rh is hitting high 70s believe 79% rh is highest I have seen. Temps at 61 to 64. Bud is swelling up very nice but I afraid of getting mold. Don't see any as of now. I have a small fan blowing on plant all the time. Hoping to harvest next week. But still seeing a lot of growth. Should I be worried?

Hei there, everything above 60% can lead to mold... explain your ac thingy again, I didnt quite get that. Are you getting your inline air from the ac? are you using a vent inside your box? give us some more details...

Get a small dehumidifier if you have the room for it in there, better safe than sorry. The RH will continue to be high as long as the lights are off. I'm guessing your RH outside of the room/tent is high as well. If your using soil then anytime you water theres also potential for a spike in RH. Keep that in mind as well.

Run....MORE ventilation at night....they will drink more for the lower RH, but its an option....really isn't too bad...79% at night....I would still check for chances of PM forming, but you are probably in the clear for now....