Do you mean the Nutrient burnt leaf tips and random downward clawing of leaf tips and dark green color ? Just looks over ferted to me
It happened even on seedlings that I only give water. Almost like a rust around the edges then edges die off Sent from my LG-H831 using Tapatalk
It looks like nutrient burn. Did you have fertilizer included in the soil and not know it? Sometimes PH issues can cause yellowing/browning because if the ph is too high or low it can't uptake certain nutrients. Cal/mag deficiency show up as yellow banding or alternating light and dark stripes across the leaves. Have you tested the PH of the water you give them and do you let it sit to evap possible chlorination?
It's not cal mag deficiency it's either calcium or magnesium deficiency. And it looks like nute burn even if you did give them plain water your soil can still be hot. Meaning that the soil is to rich with nutrients. Sent from my SM-G925W8 using Grasscity Forum mobile app