Yellow leaves, stopped budding mid flower

[axeouse]

First time grower, DWC. I have 2 GSC plants, both raised the same, one is good the other turned yellow right after flowering and is not bulking up. Any ideas what’s going on?

 

[TripsRabbit]

What do the roots look like?
Looks like severe deficiencies

 

[Aqua Man]

Natural light pics?