[Nknacho]

So this is my second grow with Nectar for the Gods. It did wonders my first grow. So im 6 or 7 weeks into veg, I have them in 3 gals(they dont need transplanted), I use medusa magic, herc harvest, mega morph, kraken, tritons trawl, aphrodites, zues juice and recharge. I only fees the herc harvest, mega morph, kraken, and tritons trawl at 1/4 strength because they are more of a vloom nite, but it has a lot of positive stuff in them for veg too. But i started gwting this brown tip on my leaves both new and older growth any ideas?