I just looked again and they seem ok. My concern is that the rockwool is too wet when watered. Does the tray fill all the way up, cause it should only come about half way up. There by not soaking the rockwool. The rockwool is around the air roots and when your plants get larger the rockwool should not get wet at all or just barely. Maybe raise the gallon bag up with clay balls under them like a bed to get the rockwool above the water level and cut back on water time. I bet they would perk up. It's all about tuning in your setup. Don't give up.