Leaves curling up at base. Is this a heat related issue or something else?

Could be too much light, or too much heat. Download the photone app and check the ppfd/DLI. You don’t wanna be over 400ish ppfd at this stage. Also consider lowering temps or increasing airflow over the canopy. Hope this helps!

My tent is at 27c and I have not noticed this on my plants. Could be an air flow issues, I have fans on a timer and it moves air aorund my plants and then the extractor turns on when it gets to hot/humid to maintain environmentals. Best to try and refresh the air in the tent more like others have suggested and see if it helps. but its all a guess, I have not seen this before. Good Luck!

Do they have air moving that hits them? Worst case put a fan blowing out one of the vent holes as well to draw more air through or provide air conditioning. I provided air conditioning to the room all my grow areas draw from. Was how I solved it in my situation. I Keep that room as cold as I can

@roberts. Its pretty hot in my tent and Im trying to get more airflow through it. I think this plant is just not handling the heat well. The other one, although it is showing a little bit, is handling it better . The lights are as high as they can be in the tent. The side with these two plants has the BP 2500 and is on the lowest dimmed position

It looks like tacoing from heat. At 80 degrees this should not happen unless your light is too close or too turned up for vegging or both is my guess.