My first mistake was not putting enough pearlite or Coco coir in the potting mix to allow good oxygen availability to the roots. Then I was over watering which only made the problem worse. Luckily I didn't blast them with fert to try and fix the problem. After I took the plants out of the black plastic pots and broke the original crappy potting mix away from the roots and repotted with a coc coir, pearlite, and potting soil mix they seem to be doing much better. My one friend told me don't water them until they look like they are getting stressed a little. I'm a newbie, but the saying you'll see on here time and again,"less is more" really seems to be fitting for growing chiles. Good luck!