Leave Burn (Too much light or nutrient burn?)

Are you putting calmag in the water between feeds??I give calmag every drink/feed I give also if a issue give a tiny bit of calmag via foliar spray but check your pH levels on run out and adjust if needed 💚🙏

To me it looks like 3 possible things. Nutrient lockout, Cal-mag deficiency, or you splashed nutrient solution on leaves? Make sure that pH is dialed in. New growth looks fine with no burn.

No diary = no information. What nutes are you giving? How much of them? What's your pH? All these things and more would go into getting you a halfway decent shot at getting a halfway decent idea of what's going on, why, and what to do about it. My suggestion is to start a diary - you only have to do two weeks! At the bottom of the week, when you save it, there's a box for asking your question... ask it there and your question will be linked to the diary so we can easily look at the info and come up with a plan for you! Good luck!