Could any please give me some advice please,

I am currently growing 10 plants under two 600w metal halides, the are in 15 litre pots with canna coco

I am feeding ph 5.5

Canna coco a&b 10ml per 10 litre of water

Rhizotonic 20ml per 10 litre of water.

The problem is half of them are green and lush, the other half is yellow curlin inwards and don't seem to be growing and I can't see any new root growth.

When I got the clones they was very stressed, I have been flushing them for the past 3 days and raised the lights to try and relive any stress,

I have uploaded two pice of good and bad so you can see
mr samsung Reviewed by mr samsung on . Can anyone please Could any please give me some advice please, I am currently growing 10 plants under two 600w metal halides, the are in 15 litre pots with canna coco I am feeding ph 5.5 Canna coco a&b 10ml per 10 litre of water Rhizotonic 20ml per 10 litre of water. Rating: 5