Tiny brown/yellow Tips

The tips of my fans are yelow/brown not getting any larger and i have not been giving to much nitrogen. What can this be? They have been budding for over 6 weeks now. Also What is the best remedy for catapillars?
 
around the 6th week of flowering you will start loosing a couple fan leaves as the plant uses its energy
 
im around the 5th week i beleave and im noticeing yellowing on the fan leaves not really bad yellowing just a slight fade in color from a week ago this is normal?
 
You still got time to give it a pinch of nutes. and yes it is normal, as long as the plant is healthy that is.
 
and i just dont wana give it any nutes seeing as the only ones i have are MG fert spikes they did me good in veg but i want nothing to do with them in floweringthere NPK is 15-5-10
 
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