Guys see anything wrong?

Just wondering what you guys think plant looks solid overall pretty much green all over no dying leaves just these dry brittle canoe shaping leaves but can't that be normal day 39 flower barney's farm critical kush

Possibly a bit of heat stress.. how warm is the temps at?

Gordo here, How is the air fan directed? How dry is the soil between waterings? How much nutes and how often?

brittle canoe shaping leaves ..? is heat or over watered related, look to your nightime temps keep a temp/humidity gauge in there, a small fan will make your plant happy?

Fan is at the canopy and there plenty of airflow temps are around 78-80 degrees humidity is like 20-22% which I what I think is causing the canoe affect which I can really raise too much. Medium is 100% coco coir watered every other day feed every water last water was 600 ppm gonna bump it up to probly 800 or so maybe little more for next week or two nutrients I'm using are advanced nutrients connossuier with bud candy overdrive. Added a little calmag this watering cause some of those leaves looked like they might be starting a mg def not sure I'm using RO water. PH is usually between 5.6-5.8 when I water when I water medium is somewhat dry not bone dry its in a 3 gal smart pot. I'm pretty sure its not heat stress cause I have it somewhat to the side not directly under the light which is 1000 watt hps about 18-24 inches away one of the mid leaves is canoeing and it is not above 75 degrees there I'd say