[honeyislandgenetics]

I’m Absolutely no Auto expert but I do know generally speaking they require less nutrients then photos and with what you have I don’t think you’d see a deficiency so quickly at day 19 especially with that manure as long as it is of any quality. All that to say I’d be very suspicious of “buffered” coco. I’ve had coco supposedly grow on plantations nowhere near the ocean and they still have issues. Cal mag is almost always a go to as long as your keeping up with the pH levels through 6.5 watering. I had a GG4 and Gold Leaf from ILGM that both threw a total BF when they went to flower. I corrected it with cal mag but not every watering. I’d say twice a week maybe 3 or 4 initially to sort it out quick and again the two a week should be enough to correct it without giving it a “CalMag” taste. I’m not speaking from experience with the calmag taste but I’d guard from fairly reliable sources it’s a thing. Hope this helps