Don't know for sure because I have been out of town since the lights started going off. But I would not be surprised in the least if it's right around fifteen degrees difference. My temps were around 73 with the lights on, and with no heat in the entire house it sure as hell felt like around 58 sometimes in the living room when I wake up. What would happen if the difference is indeed 15 degrees or more?

I will check it out when I get back home. Really don't want to need to put a heater in the room, more electricity, and then my humidity levels are going to be super low which will make it needed to water more often. But obviously I will do whatever is needed. Thanks Blue!

I am curious what is causing the curling even though it appears to be minimal right now. I am using one of those ghetto ph measure things, where you put three drops in the water. I am thinking it could be inconsistent ph levels? I really need to buy a ph pen when I get back.