Seems to me that you are watering and feeding WAY to much.MG is ok to use but like only 1-2 times a week not 2 times a day.and seems to me that watering 2 times a day is to much, i would be worried about root rot and as for the spots on the leaves maybe from nutrient burns from (MG) feeding 2 times a day. i water 1 time a day the amount depends on the size of the plant. so just try repotting them and go easy on the watering and feeding. :thumbsup: