GSC Extreme Autoflower, first timer

Week 10 - Flowering Week 6 I’ve noticed the leaves are starting to show some sort of nutrition problem. My last feeds I might have been a little heavy handed but not to much. I also had to run off and kill a bunch of Gnats in week 9. If anyone has any insight that will help. I haven’t seen any gnat in the last couple of days. But, I’m curious about the leaves. Also, should I prune anything at this point? Regards!