This has been going on for about a week now with my plant, the new growth was starting off with more yellow spots on them, but a lot of it has gone away as the leaves have matured and now the edges and tips of the leaves have turned brown and curled, as you can see. And this is only affecting the new growth, this has not happened to any of the older leaves. I can’t quite pin down what deficiency this is, I found one pic online that looks the same as what my plant is experiencing, but that same pic had two different captions, which were potassium deficiency and nute burn. Anyone here have an idea of what it is?
I’m growing in a 2x2x4 tent and using a Mars Hydro Epistar Pro 400W LED, the medium I’m using is soil and its Dr. Earth Pot of Gold soil, so far I’ve fed Dr. Earth starter fertilizer 2-4-2, GS plant foods organic kelp concentrate, Dr. Earth Pure Gold liquid plant food 1-1-1, and Dr. Earth tomato vegetable and herb fertilizer 4-6-3. Temperature has been from the low 60’s to the mid 70’s and RH has been between 40-50%, and yesterday’s pH reading was 6.8 so I’m not sure what this could be, maybe light stress?