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.

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

I hope they help

What r ur temps!!

Are the yellowing plants on the inside section of grow room or on the outside? Check feed lines and make sure they are not pinched/clogged. If yellowing plants were directly under the lights and good plants run around the outside then I would say heat/light issue but more info would be nice.

Just checked the heat, 89f when the lights are on 65f when off humidity around 60% and the yellow ones are in the inside but there are some lush ones in between the yellow one. I thought if it was heat then the nice ones would also be looking yellow.

I was thinking light bleached. Feed lines not clogged??

I hand feed for maximum control