I don't know a lot about growing in coco so I cant be 100% on my opinion but if you ended up with too much nutrients in your soil it could have caused a lock out. I might be wrong but I don't think your suppose to use nutrients every watering. I also believe your suppose to flush the medium every 2 or 3 weeks to flush out salt build up. I hope an experienced coco grower will chime in cuz I could totally be off base so just take every thing I say with a grain of salt. Its just that I have had plants look like that before and it was because I used too much nutrients but your problem even though it looks like mine could have been caused from something else. Over feeding is using too much nutrients. Don't ever think a question is dumb. Every one on this site is learning to grow, even the best growers on here. Its not something you stop doing. We learn by asking and doing.
Need deficiency help please
- Thread starter john0108
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Wile e Peyote
Who, what, why and where
hey john just seen this I would have to agree with joe I see your using canna boost at full strength I would knock it down to 2 ml a ltr along with your A+B now you have flushed her let her recover for a day and I would have stopped using rhizotonic by now (shit can be expensive) and you can over feed its just next to impossible to drown them in coco once there roots are established oh and I try to get run off at least once a week but I also use drip clean in my res to stop salt build up in the coco
oh now in flowering try to get your ph between 5.9 and 6.2
ill try to help aswell I use coco with autopots . at week 7 I was feeding 2ml a+b canna coco ph at 5.8 as your feeding from the top I would feed one day at ph 5.8 and one at 6.0 ph and just rotate like that I also feed 1ml ltr of pm cal/mag dont bother with rhizatonic its got enough of a root system but if you have cannzyme add that I use that at 25ml for 10ltrs so your plant will eat its dead roots that way and keeps your coco full of goodys 
I'm using 15ltr autopots with 50/50 coco/perlite. if you have a ec meter which you should you wanna be aiming for about 1.3/1.5 ec but you need to know what your ec is now as a big nute swing can stress the plant further. it does look like a mag issue I use plant magic cal/mag so match what your cal/mag is, and if yours is lower up the dose to 1.5/2ml, also I was using led lights so cal/mag pops up a lot if you dont keep it in check.
anyway goodluck
just looked what my cal/mag npk is and its the same as your cal/mag, just put a extra .5 every 2ltrs I had roughly the same looking issue on one of my plants, looked like rust spots on there I just upped my calmag 0.5 every 2 ltrs and it stopped progressing. I only done that for 1 week then back to 1 ml a ltr .
I'm using 15ltr autopots with 50/50 coco/perlite. if you have a ec meter which you should you wanna be aiming for about 1.3/1.5 ec but you need to know what your ec is now as a big nute swing can stress the plant further. it does look like a mag issue I use plant magic cal/mag so match what your cal/mag is, and if yours is lower up the dose to 1.5/2ml, also I was using led lights so cal/mag pops up a lot if you dont keep it in check.anyway goodluck
just looked what my cal/mag npk is and its the same as your cal/mag, just put a extra .5 every 2ltrs I had roughly the same looking issue on one of my plants, looked like rust spots on there I just upped my calmag 0.5 every 2 ltrs and it stopped progressing. I only done that for 1 week then back to 1 ml a ltr .
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John-- symptoms look like P defc. to me, but there's some overlap with Ca defc. too with certain symptoms... are they still progressing? Coco is a different ball game from soil, mate, and if you haven't done plenty of homework on it-- (fertilizing, Ca-Mg additions (coco needs more vs. soil), pH management, flushing method, etc.)-- you need to next round before you start... it is NOT true soil, and if you treat it like it is, you'll have nothing but trouble... coco growing is more like Hydro in many ways, and is unique in it's peculiar CEC behavior (that's cation exchange capacity)... Your nutes a coco specialized, right? Are you following a feeding chart? ....as for overfeeding, I see some leaf tips that are fine, but uppers shown yellowing... could be nute-salt build up, or an in-pot pH problem, maybe both... pH adjusting what goes in is just the start, not the end of pH management,... 
-yes, you can overfeed in anything!-- in coco, as mentioned, it's harder to overwater because coco has great "breathing" porosity properties,.. it's recommended to have about 20% volume of run-off, to keep pushing excess nutes/salts out,.. all this said, we need to determine if the defc. is from a simple lack-of, or is getting locked out by off-pH, which renders it unavailable for absorption: as for which one (can be more than one as well, often is in fact), a proper pH reading will help determine that when other signs are ambigious.... have you been feeding every time you water? What's your water source? I see you mention you're keeping the conc. down, but feeding every single time might cumulatively be too much,... first thing you need to do is get a proper pH reading of that coco; the best thing, especially with coco, is an in-medium pH probe, which measures directly (Accurate 8 makes a good one)-- if not, the run-off method is the only way, and it dicey to begin with, more so even with coco... still, it's better than nothing!.... follow this guide exactly- (https://www.autoflower.org/threads/...-testing-and-ph-estimation.41733/#post-928975 )....make sure your pH meter is recently calibrated and clean, or readings will be off,... Flushing is also recommended on occasion, especially with hand watering,... do you have a EC or TDS meter?
-yes, you can overfeed in anything!-- in coco, as mentioned, it's harder to overwater because coco has great "breathing" porosity properties,.. it's recommended to have about 20% volume of run-off, to keep pushing excess nutes/salts out,.. all this said, we need to determine if the defc. is from a simple lack-of, or is getting locked out by off-pH, which renders it unavailable for absorption: as for which one (can be more than one as well, often is in fact), a proper pH reading will help determine that when other signs are ambigious.... have you been feeding every time you water? What's your water source? I see you mention you're keeping the conc. down, but feeding every single time might cumulatively be too much,... first thing you need to do is get a proper pH reading of that coco; the best thing, especially with coco, is an in-medium pH probe, which measures directly (Accurate 8 makes a good one)-- if not, the run-off method is the only way, and it dicey to begin with, more so even with coco... still, it's better than nothing!.... follow this guide exactly- (https://www.autoflower.org/threads/...-testing-and-ph-estimation.41733/#post-928975 )....make sure your pH meter is recently calibrated and clean, or readings will be off,... Flushing is also recommended on occasion, especially with hand watering,... do you have a EC or TDS meter?Hi @Waira and thanks for dropping in. First yes they are progressing and the smaller one seems to be doing quite well, the other is ok it just seems to be a week or so behind but it is nearly twice the size.
My nutes are coco specific but before joining here i knew nothing and only had advise from a photo grower who basically said give them as much as you can! i hadn't really found anything Auto or LED to read except that DP AutoMazar did well under LED.
My water is tap but I have been letting it stand for 24hrs before use. Ive been watering with feed everday until now. I have just lowered the strength after advise here about not using full strength nute's.
No i was not following a schedule just going of what the photo grower had said last time, i had introduced CalMag after finding out here that its needed under Led.
I have a meter to test feed Ph but nothing yet to test the medium (can't find an accurate 8 in the UK just some cheap crap) Im trying to source some distilled water to do the run off test but stuck in work at the min so its difficult. Don't have EC meter but don't mind getting one as i intend to stick at it.
Oh the space I'm using didn't have any ventilation until the weekend but thats been sorted and they look happier for it.
Have started a BlueMazar grow with close to TaNg's schedule and the advise I've picked up here so hoping that will be better but want to get these two to the finish line as well.
Cheers @din5 I'm taking it all in (slowly)
My nutes are coco specific but before joining here i knew nothing and only had advise from a photo grower who basically said give them as much as you can! i hadn't really found anything Auto or LED to read except that DP AutoMazar did well under LED.
My water is tap but I have been letting it stand for 24hrs before use. Ive been watering with feed everday until now. I have just lowered the strength after advise here about not using full strength nute's.
No i was not following a schedule just going of what the photo grower had said last time, i had introduced CalMag after finding out here that its needed under Led.
I have a meter to test feed Ph but nothing yet to test the medium (can't find an accurate 8 in the UK just some cheap crap) Im trying to source some distilled water to do the run off test but stuck in work at the min so its difficult. Don't have EC meter but don't mind getting one as i intend to stick at it.
Oh the space I'm using didn't have any ventilation until the weekend but thats been sorted and they look happier for it.
Have started a BlueMazar grow with close to TaNg's schedule and the advise I've picked up here so hoping that will be better but want to get these two to the finish line as well.
Cheers @din5 I'm taking it all in (slowly)
Wile e Peyote
Who, what, why and where
john you can get distilled water at Halfords dude(battery top up water) and I use a blue lab ec stick great for mixing with as well never had any other ec meter so I cant comment on them
My water were I live has a PH from 8-8.5 and a PPM of around 410-420 its bad stuff. I grow organic and have to use bottled water every watering. I don't even care to filter my tap. Even filtered I don't want to drink it.
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