That one plant needs more feeding than the others.......all plants need their own schedule of fertilizers.
Just giving them all one generic formula can lead to exactly this outcome.
Remember though....what is showing now in the leaves, is a direct reflection of what was occurring in the root zone 2 -3 weeks ago, so this problem is already quite advanced and one extra feed is not going to "fix" this.
It will take a few feeds over the next 2 weeks or more to show total recovery.
Feed as normally, as in time intervals, but increase the strength slightly for just this one plant, the others look fine and obviously don't need as much food as the pale hungrier plant.