Chuck- Nice looking plant bro'! ...running on just the 5-1-1 up 'til now? That necrotic patch could pass for very early symptoms of a few things,... since she's in full bloom mode now, and has pretty minimal P and K inputs, those would be likely suspects,... what's the N-P-K on the bat poop? Definitely time to switch!...you can up the Ca-Mg to 1tsp/gal, since this is often when those defc. pop up as well,... As for the fish goo 5-1-1, I've heard from both sides of the camp on using that during bloom,... some say it lends an off flavor to the bud, others didn't notice... personally, I use too, as a change-up feed, but stop after bloom starts-- not willing to gamble- LOL! ...unless you've not had issue with it fouling the bud flavah in the past,... let's see what the bloom NPK's are, and make sure you'll still have a sufficient going in during bloom; N is needed all the time, as a primary building block, among other things,... it just doesn't get top billing during bloom...