Looks like fert burn to me, especially if you're feeding so often as a water/feed, water/feed with Advanced. That stuff seems kind of hot. The problem with alot of ferts is that the companies don't tell you how often to use their products. Also, since you're using a one gallon pot, I doubt if you have enough soil there to justify feeding so much. When tips go yellow, then brown, it usually mean fert burn. Give it a rinse, then don't water until the soil start to go dry.

Edit, I just saw your photo. I'd transplant into something bigger. Go easy on the ferts.