Calmag Problem?

Hi, The cupping leaf edges can be a few things. I looked at your diary. Your temp is great, but your humidity at 46% for veg is a bit low. Different strains behave differently in different environments. The peanut gallery will say "awww your humidity is fine, you don't know wtf your talking about." I love those guys. Try getting your humidity up to a least 60%, and even 70%, no higher. Have air circulating in the space via oscillating fan periodically blowing across the plants leaves (not constant wind) See if it resolves. If it does we'll pat the nay sayers heads together and tell them to run along. Your purple stems:. Purple or violet leaf stems are very common. Most all Cannabis varieties will develop that. It is mostly a genetic trait but it is equally pigment colour change due to, well, for lack of a better explanation, a sun tan. It's not really a concern. Purple/Violet stalks however, is generally caused my a lack of Phosphorous. Either it's locked up in the soil or you aren't feeding them enough. pH being out of range is another potential cause. Phosphorous is very available at 6.2 pH Yellow leaf tips: That is a sign of a couple things. With LED lights they can cast very intense light. So much so that they can cause bleeching of leaves, leaf tips and edges. That is usually displayed on the plant where it is closest to the light, with the lower portion of the plant unaffected. The other potential cause of yellow tips is riding the fence of over feeding. Not to the point of tip burn, but close. They will likely end up burning brown like your typical nutrient burnt leaf tips. That's if the whole plant displays yellow tips, top and bottom leaves. Disclaimer, @Polyphemus i don't lump you in with the peanut gallery so please don't take offence. I think you provide reasonably sound advice most of the time.