Plants Yellowing - what's causing it?

[Bulls]

Hello fellow stoners.
Having a little moment here. Simply said my mate's killing 4th batch of plants in a row. He's running very similar setup to mine in a 1.2 tent for long time but something's happening now. I've given him some seeds - germinated, sprouted, all healthy. Moved to his tent, same evnironment as mine - they yellowed for 2 days and died. I've rooted some cuttings for him..nice and healthy..same story. Gave them to him - yellow in 2 days, no growth...and so on and so on.
Can't think of what's causing it? We are sharing the same nutrients, he's running same way he's always done . Any of you have an idea as I've run out of explantations.

[Hmr81]

are you mixing the feed for him as well? struggling to think of other differences from your description, sounds mad.

[Bulls]

No, not mixing it for him mate. He's growing his own green for good 3-4 years now and knows what he is doing. Only thing I can think of is bad batch of Canna Coco Professional + ? He ordered few bags online which are different from mine. I mean come from a different place.

[Point 5]

thats a little crazy. if he was new to this i would over watering maybe? or a big temp change but doubt that.

not a fan of canna pro coco so maybe a bad batch? can you test it in any way with run off or something?

[GMO]

got any pics?

[Hmr81]

perhaps lend him some coco then, ive never had a bad batch but ive not been doing it that long so could be i guess.

[Bulls]

Done that, EC came out normal on the runoff.
he's not over watering, neither is under watering. Proper ball ache. Not sure what's happening.
Got no pics, i'll try grab some. They just look unhappy and ..ugly. I've told him to buy new coco from local hydro shop and see how it goes. 2nd batch of cuttings I gave him, he potted up in 5'' pots. After a week they were yellow and roots didn't grow into the new fresh medium.

[MrNice]

Mr Bulls

Get him check the batch numbers on the coco think i read some where probelems

Not me saying

"Hey guys just want to let you know something that ive discovered on canna coco in the last month... it could be a bad batch or what ever but its super low ph....

out of the bag with not plant init poured phd water at 6.2 it comes out at 5.3 ph..... that redonkulous.... just want to warn people to check you canna coco's ph because it got me pretty good."

Do seems problems on net bulls if you google

Canna Coco Professional bad batch

may help you brother

mn

[Bulls]

@MrNice Top man ! I've never actually checked the runoff Ph. I've calibrated his BlueLab and checked runoff ec but not the pH!

[Hmr81]

think you can check batch info here https://www.canna-uk.com/cannalyse