Deficiency?

start ensureing 20% runoff with ferts each time. MAy want to rebalance them as the leaves show some stress... but could be dry at moment of picture?? Wait for top portion to change color before watering again. you can fertilize each time, if you always have 20% runoff. I only see cal-mag listed. You need to provide 100% of all nutrients in a soilless grow. get some 'hydro' ferts as these will contain your primary, secondary and trace elements. a good 3-part system is what i'd suggest so you can make some adjustments to formula without buying a bunch of 3rd part products like cal-mag. e.g. JR Peters Jack's is agreat system.. their part A, some cal-nitrate, and epsom salt. if you buy in bulk (25lbs) it cots less than 4 cents per gallon. take 5-10% off instructions and go from there. You need any similar system that provides all the npk Mg/Ca/S and all the trace elemetns too. coco or other soilless substrates provide nothing on their own.. or for all intents and purposes nothing. maybe some Na from coco, lol.