My plants started to get a yellowing on the tips of their leaves roughly about a week ago. They are about 4 weeks old. I reduced the nuts to 25% and that's what I've gave them since. The leaves on a few of them are starting to curl since yesterday and this was scary for me. I'm in 4 inch pots and I don't know if that could effect it? Until yesterday I was on a 24 hour schedule and I just moved it to a 20-4. Please reply if you have any advice thanks so much!