Are these spots fungal? I had this happen last grow in this tent with a humidifier, though I’m not using it for this grow. I’ve bleached the tent and pruned the leaves. Am I in trouble?
Its just starting so don't worry to much. Its either potassium deficiency or cal-mag deficiency. I'd start with cal-mag as it's much harder to over feed cal-mag. If it's a potassium deficiency you'll know because it will get bad over a few days but it's easy to fix and takes only a few days to stop symptoms.