Looks pretty normal during flower.. My bet is this one turns a little purple on the fan leaves. At this point (4+ weeks), you should give it a good flush with water pH adjusted for coco.. Assume around 6.0 give or take. If you don't measure pH, just use water. Discard the drainage.. After it dries out a bit resume your feed/water schedule. Be patient and see how it's looking in 7-10 days. Keep in mind, in late flower some of the larger fan leaves will yellow (or similar) and drop off.. All normal.

Good luck!

Farmer Rich