gdogfunkanswered grow question 5 years ago Yes, you are fine to do both. They are doing different things for the soil. I use LED and I add Cal-Mag to every single watering (5ml/gal) and add molasses (Hi-Brix Molasses for Plants) at 5-10ml/gal as a carbohydrate source for the soil microbes I add (URB organic). "Feed the soil, not the plant" as they say...