One plant yellowing

Ok so, I have 1 alaskan purple and a pineapple express, both auto’s. I have grown a number of autos before but don’t know whats happening. All of a sudden the alaskan purple plant is yellow and bad looking. The PE plant is in the exact same conditions with exact same nutrients and looks great. Temp is ~73 F, humidity about 45. They are a couple weeks into flower. (42 days old). Feeding Nectar for the god nutrients like I always do at 1/2 strength. I’m thinking there is a nitrogen issue maybe? not sure. sorry for the pictures not being in natural light I took them this morning and cannot open the tent all the way since I have other plants on a 12 darkness schedule close by. one on let is the alaskan purple in question. any help would be much appreciated. Thanks!

White light pictures please: nobody can see anything under the blurple.

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