GMSgrowsanswered grow question 5 years ago Normal for some to change, but if all are changing and no new growth, then you may be overfeeding them, or a little nute lockout going on from salt build up. I would simply water until you start seeing a difference. 10 to 20% runout after watering. Check the runoff to seem how high your nutes are built up in there. Make sure your ph levels aren't way high in the runoff water as well.
Hope this helps. Good luck