russrahlanswered grow question 4 years ago Could be either over or under watering, or ph problems/buildup in soil. Check your ph going in and out, should be roughly the same. If you have way higher or lower coming out then you may need to flush. Check your ppm in and out as well at the same time. If that’s all good then you could be over or under water them. Usually people do over more then under though. Hope this helps. Cheers 💨