HELP, Quick question! Regarding purple coloring in leafs.

My plants are in week 9 of a 10-11 week run.
I just recently started running an air-conditioner in the room, but it hasn't drastically dropped temps (only 5-12 degrees depending on the day).

This morning I woke up to a ton of purple showing up in my plants:


I haven't seen a single issue with a deficiency in my plants thus far, but this is my first grow... making sure to attack issues the moment they arise.

Phos Def? Temps? Girl Scout Cookies in late stages showing their true character?
What do you all think it may be? Appreciate you taking the time to read thus far, help a brother out!

WHOOPS, nevermind. Just checked the lows on my temp gauge and it went as low as 35 degrees last night. Lol, Might need to stagger the timing on the AC a little bit...





Please delete the thread if you'd like (to any Mod that may be out there)
I can't figure out how to do it on my own, about to add this information to my journal and don't want to look like I'm spamming the forums =/