Browning on the inside of leaf with wilting??

I am one week into flowering and am having this problem. I have been seeing alot of gnats so i used two sticky traps and sprayed the hydrton down with mighty wash real well. I cleaned the system reall good with bleach and H2O2 3%. i flushed it with a hose 3 times before using it and even ran a few extra gallons of filtered water threw it. i am currently trying a flush thinking maybe i used to much nutrients. i used both bud blood and bud ignitore...would that cuase it? i am really at loss and would love some help guys. this is only grow #3 for me so yeah i am new. please im me if you can help. i have pictures i can send. thanks in advance!photo 2.JPGphoto 3.JPGphoto 4.JPG

Yes, the larvae will feed on the root system. Look at your roots to make sure that you do not have root aphids as well... not sure on combating them in hydro as I am a soil grower.