Used this product for a few weeks, then some of the leaves started to get yellow edges. Some research on deficiencies made me believe the cause was to much Calcium. ? I read an article on 'The myth of Cal-Mag'. The article warned of over feeding Calcium and that there has never been documented research that cannabis plants need additional Calcium or Magnesium other than that found in soil mixtures. ???? Now I do not know what to think, To Feed or Not To Feed.k