Hey, dont even worry about it guy..... during the last weeks of flowering the plant begins to naturally use up all it's nitrogen therefor the unhealthy looking fan leaves. Some strains foliage will even turn a bright yellow or even a crazy purple color basically mimicing the fall leave change. So all in all dont worry about it guy.:rasta:

Actually the plants are looking nice. I would stop feeding them soon actually and let that nitrogen get used up.

Peace,
Cptweedmanguy