Plant health issues in coco coir

Well im on my 2nd turn.. and the first one went very well until mid flower when i started showing the same issues you will see in the pictures. I am about to switch these to 12/12 but I am having trouble getting them healthy.



Medium: 75% coco 25% perlite

Nutrients: cns17 + Silica + Cal/MAg

Lights: 2 1k watt lights over 8 plants

Strains: Chem and Headband

Plants age: 2 months

Container size: 7 and 10 gal

Ventilation: 500 cfm

Temp: 70-77

Humidity: 38% (Low but a few months ago when i seen these problems it was 65%)

Feeding: Feeding 1.3 EC for the last 2 feedings, I water once my pots are light. every other day now. I have a very airy mix so I dont believe its an overwatering issue as i have let them dry out over the last week

I do feed with every feeding (Your suppose to with coco) and I do believe I was over feeding for a few (like 1.5-1.7). This is what I thought the issue was the last run because it took a while to flush and get a low EC. With that being said you will see the plants have rigid edges like they are heat stressed and are dry to the touch. Now I dont have heat issues and I dont believe the humidity would be causing these issues..

So my conclusion was over feeding but after doing a few wet/dry cycles and feeding at 400ppm (250 is tap water + Cal/mag) the problem doesnt seem to be correcting itself. Its been about a week and I really need to go into flower now.

Any suggestions? I know your not suppose to flush coco the same way as soil but if others also think its an overfeeding problem I may flush with ph water + clearex. Then follow with a low dose feeding. The big fan leaves are dry and rough and the leaves near the top are curled under (kind of like a n toxicity) and the brand new growth is folded in like a flower opening up.

I appreciate any input. I was stumped by this last run and apparently this run also. Also forgot to mention I have pruple stems a lot fo supplementing cal/mag and for some reason my partner hit them last week with a low dose of bush load which is a growth regulator (he thought we were going to switch to 12/12 and use that again to limit the stretch. So I suppose that could be an issue too idk thats out of my league

happy toking

peacepipe

Don't let coco dry out,water more often with low ec.Always dtw every time 10-15% run off..and use H&G or canna specific nutes. (Drip clean is awesome )..

You don't feed every watering with coco.... that's just over nutes and I grow with coco and have been for over a year never have problems and flash is right don't let it dry out get a watering/feeding schedule.

I usually always keep it moist but just to rule out over watering I let them get pretty light over the last few weeks

Ive planned on switching to canna after this run. I usually water till I see runoff every time. so you guys think I shouldn't feed every time? or just lower the EC?

also its not looking like lockouts then? I ph to 5.8-5.9

I feed every time never over 1.0 ec and I use drip clean...no perlite

BTW just to follow up I reduced my feed to 300-700ppm alternating heavy and light feedings and they like it so much better

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