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@blue 
-- I didn't get the damn tag Blooo, so sorry! Holler louder next time- 
... this is what happens when you don't get me the "close-up's" I ask for..! 
... Sooo, I think you have a rare one(s) here luv -- -B defc., maybe Mn defc.,... these are rare, as such and I don't have a lot of experience with ID'ing them, and good reliable pics are scarce,... but this looks a lot like what Greenskell had on his Think Fast, and we decided it was B defc. most likely, so he treated with borax... and it worked! Our speculation was that he had a lot of Ca in there from supplementing, and too much Ca can mess with B uptake,.. you have very hard water, lots of CaCO3 in there, and after a while it accumulates since you have zero run-off,... like Fe, Zn, higher end alkalinity (6.8+) will also start to lock B out due to chemistry changes,... Do you have an Accurate 8 unit?... Mn is a little a little better on this, but since you're in coco, not true soil, best I can due is sort of "average" out what the charts indicate on soil vs hydro--
.... Now all that said, P demand is high now, which can cause similar necrotic spotting, and color fade (not listed per se as a symptom, but I see it too often to be coincidence).. Ca can too, but it's far more rare to see that larger blotching, and no fine rusty ones either, so I rule that out,.. K too, that always hits the margin teeth first and worst,... Another co-possibility is S defc, which some epsoms can fix forthwith! S fades the whole plant usually, top worst and first as it too is immobile,... that you can just go ahead and do, 5ml/L into pots and/or foliar... do you have wetting agent, or castille soap? I like Coco-Wet,....
None of the Biotabs products will fix this directly, especially if the in-pot pH is off,.. My call is to get boric acid (contact cleaner?) or borax itself and water it in, plus maybe foliar treat, 5ml/gal.... or get a dedicated Micronutrient supplement like Earth Juice Microblast, or equivalent.. not sure what's in UK for this that isn't gods-awful $$! .... Ditto for Optic Foliar Transport used with boric acid, or microblast to literally soak in in there,... All the mentioned micro's are immobile within the plant, so foliar is usually the best and fastest way to treat,.. soil drench works, but is slower,.. but once in established tissues, there they stay,....
-- I didn't get the damn tag Blooo, so sorry! Holler louder next time- ... this is what happens when you don't get me the "close-up's" I ask for..! ... Sooo, I think you have a rare one(s) here luv -- -B defc., maybe Mn defc.,... these are rare, as such and I don't have a lot of experience with ID'ing them, and good reliable pics are scarce,... but this looks a lot like what Greenskell had on his Think Fast, and we decided it was B defc. most likely, so he treated with borax... and it worked! Our speculation was that he had a lot of Ca in there from supplementing, and too much Ca can mess with B uptake,.. you have very hard water, lots of CaCO3 in there, and after a while it accumulates since you have zero run-off,... like Fe, Zn, higher end alkalinity (6.8+) will also start to lock B out due to chemistry changes,... Do you have an Accurate 8 unit?... Mn is a little a little better on this, but since you're in coco, not true soil, best I can due is sort of "average" out what the charts indicate on soil vs hydro--
.... Now all that said, P demand is high now, which can cause similar necrotic spotting, and color fade (not listed per se as a symptom, but I see it too often to be coincidence).. Ca can too, but it's far more rare to see that larger blotching, and no fine rusty ones either, so I rule that out,.. K too, that always hits the margin teeth first and worst,... Another co-possibility is S defc, which some epsoms can fix forthwith! S fades the whole plant usually, top worst and first as it too is immobile,... that you can just go ahead and do, 5ml/L into pots and/or foliar... do you have wetting agent, or castille soap? I like Coco-Wet,....
None of the Biotabs products will fix this directly, especially if the in-pot pH is off,.. My call is to get boric acid (contact cleaner?) or borax itself and water it in, plus maybe foliar treat, 5ml/gal.... or get a dedicated Micronutrient supplement like Earth Juice Microblast, or equivalent.. not sure what's in UK for this that isn't gods-awful $$! .... Ditto for Optic Foliar Transport used with boric acid, or microblast to literally soak in in there,... All the mentioned micro's are immobile within the plant, so foliar is usually the best and fastest way to treat,.. soil drench works, but is slower,.. but once in established tissues, there they stay,....
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You made it - not at all lured in by the close-ups!! 
... and my Herd is angry at the suggestion that i would douse them in contact cleaner! (but maybe, just maybe thats the way to make them work harder!?? .... punishment for the herd!!!) 
.. did you figure out the element symbol scramble yet? 
.. simplifies matters in fact,... IF you had that Accurate 8! ...cough up the quid luv, you'll never look back! ... your water, is that what you had been using before changing? (cumulative caCO3, plus what's in the soil as lime, plus Tabs.. might be behind it) ...I really do feel it's needed to check my friend, alkalinity is a suspect here for sure,... generally, soil has a tougher time buffering alkalinity than acidity..... but I too had some issues with micro's on a couple of my photo gals, Zn I believe.... so it could easily be either case,.. trouble is, treating/feeding in-pot when pH is off ain't gonna work as you know.... What I like about the dedicated micro'-supp's is it's a shotgun blast of them all, and often there can be co-defc.'s but only one shows well enough to ID,... this way your butt is covered (snicker) regardless,... I wish i knew what was readily available out your way,.. perhaps the Earth Juice Microblast is?....... LOL!-- no worries about the boric acid mate, with all that hard water, and the low conc. used (still 5ml/gal, or say 2ml/L) it'll be fine,...I think most drug stores will have boric acid.... I like that better because it's already in solution, ionized and ready to absorb,... you can mix it with some Orgatrex or Boom Boom if you like, for chelation,.. but as a foliar, I'd stay straight solution there,...
Oh!- that's nast-eh,.. 
-- 
-- Transport + micronute's will beat pretty much any defc. with a cricket bat!
Cheers luv! ...Anytime,...
