Weeks of no growth,fading.yellowing.(slow death/discoloration) please help this noob!

Hey guys been having problems for the past few weeks starting these seeds. They started hahing problems fading and yellowing. So i assumed it was lacking N. It ddnt get worse for abit then it started. Back and forward with res changes.still not much.
They havnt grown abit. I cant notice anyway. the bigger ones fan leaves are slowly yellowing out and dying folding upwards not drying out completely right away. The stem looks fat as. :s
I slightly pulled bit of the roots through the cup two days ago because they wernt poppin through. They are fairly big.still dark from the transplant not properly cleaned Etc. The little one seems slightly burnt so i emptied some res water and added some plain phd water today.
dunno what the hell is the problem. Lockout maybe. Please help someone. Im surprised they are still alive!

First get them out of those solo cups with the white lining on the inside. Roots need complete darkness and with the white inside of those small cups light may be hitting the roots. I recommend getting some black pots. Sorry to see this happen

How old are they? You said they are 'weeks' old. Have you grown with this method before?

Yep, Get much bigger put dude, they are root bound....do it asap!

What nutes? What strength?
what's ph... res temp?
How far from cups is res solution?

Yep what Marc said , Get Bigger Pots ASAP , Supa root bound .. Good luck

also, it wont hurt, to dissolve one teaspoon of epsom salts into a cup of warm water, add it to a gallon of water. and water with this. looks like root bound, too, but may also be a mg deficiency. it wont hurt, in either case.

Yes i have grown witb this exact method twice. If you look at my recent threads i have posted my nutes and a little more info that might help. And i have added epsom salts last week and yesterday. I dont understand. I mix my own shit nutes too. As i said before recent threads state the %% of all my nutes.

What everyone else said! gET SOME BIGGER POTS!

They are not root bound. They started off with a n defficiency
Roots arnt even growin and popping out on smaller plant and i had to pry bit og the big ones roots through a hole in the cup.the roots on that are ok.nowhere near root bound. This is a dwc bucket aswel btw!