Never really noticed this before, but it's al...

There is a chance. That's just the way it looks, I mean Iv'e seen thousands of cannabis plants but not millions and there's always mutations :). If it doesn't get worse or develop any other symptoms... When I'm looking at the pics again it looks like it's like that generally all over, might just be the way it is...

Humidity and temps are perfect according to kPa chart. Averaging 73f with 50% humidity. Light is hung within manufacturers recommended parameters (16"). And is also covering recommended area. Fan oscillates and is not centered on plants, more the 16" gap between plants... but still hits them. Tent bottom is cut out and leveled with buckets, and all air intake comes from here, drawn through and out the top. I find it very hard to believe it's heat, humidity or water (in my case it would be a lack of O2 in the water). I've looked through a few grows that use most the same nutrients in hydro and see this on a few of their grows, but they don't seem to notice, or bring it up if they did. today i am noticing either a deficiency or lockout. My ph was also higher than it should be, but still within limits. I've changed out all the water in the rdwc (it's been a few weeks) and cleaned the buckets. All the air stones were working great (so enoug O2 in the water) and the only discoloration on the roots is from the Floralicious Plus. I also left out all GHE additives and added AN Overdrive (I'll update nutes) I'm going to hope that they will be looking better in a couple days. The leaves themselves are not curling as seen in the pictures. Only the "envelopes" are pointing up. Possibly the plant giving early indication of deficiency. HOPEFULLY find out in a couple days.

Two reasons. It's either too hot or they're not getting enough water. The reason they curl up like that is an attempt to catch every last drop of water...

Heat/ humidity stress almost for sure. If it’s uncomfortable for you then it’s uncomfortable for them! Make sure lots of air movement! Place your hand on top of canopy and see if it feels like you could get a tan, you don’t want that. Hope I helped!

It looks as if the plant is showing signs of heat stress. Which can be caused by too high temperatures or your lights being too close you can tell because the leaves are starting to "taco". If possible I like to keep my lights within 18-24 inches from the canopy which helps prevent this problem. Good luck with the rest of your grow growmie

Hi buddy this can be caused by pH issues or over watering, I had same issue on first grow :) 🙏

Lux meter reads 50k at canopy. Light is at 16" i'll try 18""

usually that's just a sign your plant is signing the light is too close. Consider downloading a Lux meter for your phone and checking to see or just move your light up four inches and see if it improves.... If you can try to get that humidity down tho, you do not want the ever dreaded bud rot to happen...