I think when he speaks about Lucas Formula it means that he just use the Micro and Flora bottles, not the Grow one, so not a standard & recommended. Maybe it is a nutrient burn for accumulated salts because of a lack of flushing. Never used coco but they say between some feeds you should give a flush regularly with pHed water to clean it … 
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I use coco/perlite and I never do. Fine results. Flushing with nutrient free water in soilless media isn’t necessary.
This guy is using rockwool.
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Rockwool or coco are soil less media, same treatment, congrats if you never have a problem, but this guy has.
You’re contradicting yourself, now you say flushing is not necessary, how do you get rid of salt buildups in your opinion?
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Flooding in active hydroponics is just part of the feeding cycle. It has nothing to do with nutrient free “flushings”. You shouldn’t use nutrient free water in hydroponics. Rapidly growing plants don’t need that sort of stress.
To reduce salt buildup in bottom fed hydroponics like ebb and flow, simply pour regular nutrient solution over the top weekly. Most people also run drip clean.
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There’s no flow here, this guy brings the water and drops it in the tables, so unless he lowers the EC I don’t know how could he get rid of the salts, even flooding from the top.
I sincerely don’t think plant stress while receiving only pHed water, even in hydroponics. I only run DWC once, and as I couldn’t flush her I just let her with pHed water and no nutes the last week, no prob at all and good final flavour, not harsh. The plant just begins to take the nutes from the leaves, as in soil …
I would just rinse all the cubes with pHed water no nutes, clean the tray in case there were slats accumulated because of the evaporation and lower the feed to see how they react … 
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A friend of mine used to do hydro and always used to let ph drift as not all nutrients are available at fixed ph.
Can’t remember ratio but is same difference as soil but at lower ph.
It’s just soil has buffers at 6.2 I don’t pick up some nutes but you don’t worry with soil.
This is more acute with hydro matey dosent have problems but is he running optimal conditions?
You can’t change the fact that there is no one ph measurement that picks up every nutrient that’s scientific doesn’t mean you can’t grow but your not giving optimal
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You’re right, fortunately I solved that using Advanced Nutrients pH Perfect that has a component that chelates all the nutrients and make them available to the plant independently of the pH range. Since then I only use the pH measurer when I flush, easy does it …
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Yeah a friend of mine used to use a similar product called equaliser that was formulated for Thames water.
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Thank you very much!!!
3 feed them now three times a day. I changed the nutes and sometimes only added 75% strength of nutrient formula. The problem seemed to have stopped.
But how about this now: Some of the plants (the ones with the most buds) are looking like… (have a look at the pictures) is it nitrogen? What to do, is it normal? I guess they are now at week three or four. Strain is critical mass from nice guy. They not take long in flower.
Pic #5 loos like Calcium deficiency to me, but if you’re not giving them nothing from the Grow bottle could be also N, even if it is not so needed in flower stage …
@SamandMax nice man glad you got it all sorted out. Seems like it was the flood frequency.
Leaves will probably need some time to recover, I don’t think you’re experiencing any significant deficiency.