Leaves

Hi, looks like a little nitrogen tox, and heat stress. Also ph?

Sounds like you got a weird one here. So, there are a couple odd possibilities. This could be nute burn. Looks like you've had some nitrogen toxicity. This could be a more advanced stage. If you had N toxicity and already took care of it, disregard this. Next, and probably most common, would be a lockout caused by excess calmag. At this point in the grow, if you've been feeding calmag straight through, discontinue using it for now. Calmag builds up in the soil or coco over time, and eventually causes potassium lockout. Last possibility in my opinion is a bloom booster mishap. Too much P and K can lockout micronutrients including calmag which can cause this problem. I realize this kind of leaves you guessing, but you should know which of these are most likely. Good luck!