Help with seedlings

These seedlings are 4 weeks old, they're in coco and were under 125w cfl in a wardrobe until a couple of days ago when I put them into my tent under 600w hps. They've had one quarter strength feed of canna coco a + b.

i havent grown from seed in a while, i've been cloneing a while. but right from seedlings i give what the canna coco schedule says and have great results.

View attachment 2459002there is a thread on this site just for growing in Canna Coco

https://www.rollitup.org/nutrients/225396-official-canna-coco-nutrients-thread.html here is a link. lots of great people to help ya with growing in Coco

Anyone know why these are struggling so much and what I can do to help them?