Thread's title says it all. I've consulted all I could on diagnostics, but I haven't found a single clue. Could you please help me?
these guys are just barely plants. from pictures and text you probably overfed your plantlets[too high a ppm count] do a flush with ph ed water in the 5.6-6.2 range and very mild ppm fretz drench say 100 -200 so as not to stress osmotic pressure in root mass. go to supermarket and buy a couple of gallons of distilled water [ph-0 &0ppm] to mix with, usually costs $1 per. this distilled stuff is great for seedlings/young plants to mix your fertz. a couple drops of superthrive[$10 sm bottle at home depot] and any b vitamin supplement/additive is a good add to help with stress. wait a bit after flush and feed with a grow fertz but keep the ppm's low and raise week to week and watch tips of leaves for signs of nuit burn[yellow/brown] and lower next feeding .if burn gets worse then flush again etc. etc.