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Plants are looking ok maybe just a little light in color. Are you checking the pH of the runoff water when you water? The natural pH of peat can be as low as 4 way to acid for MJ. A lot of mixes add limestone to help offset this but you need to know where your soil is at to avoid nutrient lockout issues. You should be measuring the pH of the water you are giving them after adding your nutes and then compare it to the runoff. You should also add a cal/mag supplement as autos tend to need a lot.