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cal mag is where i am leaning to. would a ph that is too low cause this deficiency to show this way?

nothing yet. they cloned in 16oz cups til rooted. 50/50 mix of ocean forest and light warrior. then went to a one gallon pot with a mix of 2/3 ocean forest and 1/3 light warrior. they had been vegging for about three weeks when this happened. i use tap water that is ph'd down to 6.5-6.8

up until about 2 days ago, this plant was vegging great and growing about an inch a day. then in two days the leaves curled under and copper colored mottling between the veins appeared. it was very abrupt. my two new seedlings (different strain) are doing the same thing. i have been reading...

could any body please tell what causes, and how to prevent, the copper colored mottling near the serrations on my plants. thanks