-- shoulda mentioned, these 2-3 part nute's are broken up in part because some nute compounds don't get along well with others while in conc. forms,... So if you leaves out part of the series, like Flora has, you end up shorted on certain nutes,..no one or two bottles will cover all the bases basically,... Have you done some homework on coco, mate? We have a great section here on it, with lots of good info,.. it's an excellent medium, but is unlike other soilless types (peat based) and sooo not a true soil,.. it has some odd CEC properties (cation exchange capacity), namely, it's a serious Ca hog, partly with Mg too,.. the particles bind these cations to the surfaces strongly enough to prevent the roots from absorbing them until the coco is "saturated", them it starts to freely give and take with other cations,... coco is really treated more like hydro in some ways,... you feed dilutely every time, never just straight water (messes with CEC),...Ca-Mg at least in the water,... and to prevent nute build-up, you're supposed to water to 15-20% run-off to keep flushing the excess out continually,... coco has great breathing and water releasing properties, making it far less likely to cause overwatering vs. soil or peat based stuff,... pH should be around 6.0, vs 6.5 in true soil,... to monitor all this you need a pH meter, a TDS/EC meter (to check nute conc. going in, and watch run-off ppm/EC for build-up),.. an in-pot pH probe is wise too, like the Accurate 8 pH probe-
... though, with good run-off discipline, you can just test that instead and get a fairly accurate reading,...
Post us whole plant pics in normal light, just to check somethings out,... LED is lousy for diagnostics! .... BTW, lights are too close, 18" at least for bloom,....
-- no Micro, why? that's a big part of the N content, plus all the micronutrients which are critical for so many things in the plant,... what I see in the fading leaves is mainly N defc.,.. the plant is tapping into the lower fans for it... some of which is normal while blooming, but too much too soon indicates low N content,... are you using any Ca-Mg? ..might be a touch of Mg defc. showing too,... in coco, this is more important than true soils, as coco tend to bind and hog Ca and to a lesser extent, Mg to itself strongly until the CEC demands are sated,... are you feeding to 15-20% run-off? Another important thing with coco,...
