Hi all, I've transplanted some seedlings from rockwool into my Aerogarden, and most of them are getting yellowish brown leaves, with some of them curling (see pictures). I measured the pH of the reservoir and found it to be 6.5, so I adjusted it to about 5.5 and the problem persists. I have the pump set for 1 minute on, 5 minutes off. Can anybody tell me what I'm doing wrong? (I know I have a lot of toothpicks, they kept falling over so I decided to play it safe! ) Thanks!