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Starting everything off with 50/50 ocean forest and happy frog with a top layer of promix hp. Planted directly in soil and waters a little bit. Vpd and ppfd dailed in right so let's see how she goes.
I don't think this is a nutritional burn, but a burn caused by water collecting at the edge of the leaf due to the high humidity. The water works like a magnifying glass, combined with the strong light it can burn the leaf.
Try to keep the humidity at around 50% in vegi and later around 40% in bloom.
Hope this helps.
Cheers 💪