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One looks perfectly fine. It could be the light, this thing is very strong, it exceeds PAR of the Sun. Vic from Amare states "Perky and prayin', just like we like em. No worries on the curling, because they're still nice and green with no burning or drying along the edges and tips. Could be just genetics or early signs of magnesium deficiency. Depending on the strain, they tend to use up more of it and calcium from the increased photosynthesis rate due to the intensity and spectrum. We recommend watching for these two deficiencies, especially with the combined COB/monochrome spectrum on, due to the intensity."@Waira needs to look, hope he don't mind.
tips look curling up, lights to close maybe and the plants look to light,you feeding magnesium or is it nitrogen actually.
but they look healthy otherwise.
I could be wayoff though, I don't grow like that.
I just finished growing out a couple C4's neither did this under MH Led's. I've increased slightly the cal/mag I'm giving them, hoping they straighten out. I don't check PH. What's different about this soil from my usual is I added coco 25% and I did not add lime like I usually do.
I'm open to opinions
Peace