That definitely could have been the problem my first year because I used tap water that had a TDS of 110-120, but for the 2nd year I purchased a RO system which I've used for the last 12-15 months. Also I'm adding CalMag with the RO water. I keep the PH between 5.8-6.3 and change the 12 gallon res every 10 days. I feed the plants just ph adjusted water for the last 10 days and change that plain water every 2 days. Thanks for the input.