Stress/nutrient burn

Hey! I'm currently on my 3rd grow myself and unfortunately can't see how moist your soil is... Anyway, from my experience, I know that my soil was definitely too wet and I added too much fertilizer! I was able to fix it by waiting until the soil was dry, and I let it dry out for 2 days. Then I watered gently and didn't overdo it! I use a guideline of 0.1l of water per liter of soil and wait until the plants have been dry for 1 day. But before that, if there are still a few healthy leaves, I would cut off all the infested leaves or at least the ones that look the worst! It takes energy away from the plant. Or it could also be that the light is hanging too close and burning the leaves. I also cut off the leaves to refocus on growth instead of dealing with dead leaves and raised the light higher.

For this calmag deficience a foliar application of epsom salt will resolve it soon. After try to not have a heavy hand on nutrients. Best grow. Bye

You have 2 issues. A calcium deficiency and a pinch heavy on nitrogen. But nothing to worry about yet. Good luck and happy growing