Little help please

[Rookie]

Any ideas on this auto? Looks like some yellowing starting.

Growing in coco/pearlite mix
GH nutrients with cal-mag
Ph water at as close to 6 as possible
Day 30 from seed

Thanks a lot in advance!!

 

[Waira]

-- you mean at the tops? get me pics in normal light please, blurple is lousy for diagnostics! That said, it may be a micronute defc. starting, since they are immobile within the plant, it'll show first and worst at the tops... Coco growing is not done like true soil, usually in hand watered pots it's labor intensive because you feed weakly every time, to 15-20% run-off, testing both pH and TDS going in and coming out to monitor any nute salt build-up.... I see no info about in-pot pH, run-off pH and ppm, input ppm's and pH... We need info about your dosage and feed frequency too,...

 

[AutoLowRyder]

I see no info about in-pot pH, run-off pH and ppm, input ppm's and pH... We need info about your dosage and feed frequency too,...

In addition, if the grow medium is at alow lights out temperature below 18c say.......... phos deff will also start up. Do you feed your plants with water 2c above your soil temp ??.............. this also helps to keep the root matrix temperature up.............. ALR