You think feeding them daily may be the culprit? Maybe try flushing for a day or 2 to sorta clean them out a bit and see if that helps.
FOE20-lol No weight at all man. I agree with yours and dansbud line of thinking.
What about salts build up ? have you let the pots get dry at all ? do the pots set in the runoff for any length of time ? The 1 time i had salt build up in coco from letting the runoff set to long ... my plants threw a major fit !!! they looked like they were going threw a reveg ... throwing 3 blade & single blade leaves ... all dark green like a N toxicity .
How about K deficiency caused by excessive transpiration due to lack of humidity? Possible? My caliber III and another solid meter were both wrong. My humidity is @ 29% and has been for a few weeks despite me running a humidifier. Giving CNS17 a chance instead of maxi. First watering earlier, will see how this goes. Up until now they have been getting nothing but plain pH 5.8 water for 3 days as this problem was not getting better by nuting. Doesn't seem to be root aphids through my scope.
Update with new pictures. Started feeding with cns17 coco grow with some bioroot. Have white roots shooting out the bottom now but no improvement after days. New growth is still stunted and yellowing. pH of nute mix was 5.8 and I watered very well through. ppm of 600-800 the past few days with zero improvement.
Notice stems are purple and woody. entire plant seems affected now. I keep thinking pH but I am running so much 5.8 through this shouldn't be an issue my tap is not that alkaline.
Could be a lot of things, but I would highly recommend adding H&G Dripclean to your regimen. 98% of all issues I have went away with adding this. I'm Coco/Perlite 70/30, Maximbloom and tap water seedling to chop. Seedlings get 3.5g/gal everything else gets 7g. MAg whore OG's get a little epsom. Also I run ph 5.9-6.0.