Please!!!!! I need help. Diagnose my plant.

Im not sure what is going on. My POGK clone is about 2-3 months old. I run a 5gal DWC all parameters in check that's y im not gonna list them all. I just need help please. i dont know y all of a sudden the leaves just started yellowing. i change the re every 2 weeks. i want to put her into bloom but am unsure if she is healthy enough to do it. so any advice would be so helpful also questions i will happily answer.

I can't see any yellowing from that picture.. but looks stretched to me.

Pics my friend. Where is it yellowing? How are your roots? Yellowing is lock up or nitrogen, if roots are shitty it's lock up, flush them keep ph higher, if roots r ok give them more nitro. Change water weekly ESP in flower. I veg 2 wks ps hydro qs I'd ask daytz on he's good. I'm learning dro myself but am a pro outdoors and good in soil.

Low light, ph lock up. Didn't c pic right away. Pick off shitty parts, flush in phd water. Change water more and add between. Top ur plants more and fim and supercrop

More light too

did u just change your rez and this happened? I would say change the rez back to just water until it recovers u possibly locked out although cant really see any burns..

if all else fails I would flip it the change in light will boost its energy to stretch and then start its flowers

good luck

I think your larger concern is how little that clone has grown in three months.