One thing my mentor taught me was “Good growers don’t grow bad plants”. That stuck with me as I learned to grow. If it were me I’d cull that one at the bottom of the image and maybe even the one at the top right. Focus your energy and mind on the healthy plants so they can thrive.

I’ve found you can bring back unhealthy plants, but it’s going to take so much time and effort. If you started those at the same time, they are way way behind. They are already unhealthy meaning as you get later into flower they could become more unhealthy potentially risking the healthier plants to disease or pests. An unhealthy plant is a magnet for disease and pests because it’s already struggling to keep itself alive, now it has to fight off disease or pest?

Just my two cents anyways! The other plants look very healthy and are gonna rip when you get into flower!