Thank you Weedhound for your response It's been about 4 or 5 days since I started to notice the problem and it is steadily getting worse. The good news is it's only affecting 3 out of the 14 plants that I have but I still want to save them if I can. Update on their status is pH 5.75, ppm 475 and res. temp 72 at day 28... temp in room is 77 and 42% humidity. I've been reading like crazy to try to find out what's wrong... what I've come up with is either nute burn or pH problems (most similar looking pictures to mine) but still not sure... I'm going to flush them again with pHed water and turnoff pump to see if their condition improves or not. Thank you for your time and here are some new pics.