What’s Wrong? Is it CalMag?

[BudMane]

My girls are starting to turn yellow they are 4wks flower and some hairs are starting to brown I’m using flora flex at 3.5G per gal they are under a spider farmer SF4000 and a SF7000 do they still need to to be supplied wit cal mag with the led lights I’m not to sure my last run I did with hps did not yellow up like these are

 

[BudMane]

Oh they are Also in coco

 

[Stoneisland]

What you EC you feeding it?

 

[Skunksta]

They do look abit on the yellow if you have gotton away with no calmag last grow in coco you did well.
I would defo say its calmag as you dont use any sometimes i can get away in flower long as i feed them well
in veg (calmag) but never not used it in coco. and welcome

 

[013]

I dont grow in coco but everything I’ve read about coco points to cal-mag being a necessity.... mag helps power up chlorophyll which is one puzzle piece of the green... the other being nitrogen. So yeah if you are not hitting her with cal-mag then you should start

 

[BudMane]

What you EC you feeding it?

Ec is 2.7

 

[BudMane]

I dont grow in coco but everything I’ve read about coco points to cal-mag being a necessity.... mag helps power up chlorophyll which is one puzzle piece of the green... the other being nitrogen. So yeah if you are not hitting her with cal-mag then you should start

I was giving cal mag in veg but in flower I just cut it from the schedule

 

[Skunksta]

That’s pretty high but looks like your girls handle it. Your water must start at 0.4/8cause
Can’t see any tip burn. I would defo add calmag in coco my friend just don’t over do it I would start at 0.5 pre L

 

[Stoneisland]

My starting ec is 0.4 and I only use calmag at small dosage in veg with coco. Your ec seems really high though

 

[Jypsydog]

No spots so it's not calcium. The light chevron look to the leaves tells me Mg.
Try adding a tablespoon of Epsom and I bet you darken up.
You feeding the calmag to the coco so it dosent steal from the plant. Might keep it going @ 2ml. to keep it balanced.