For soil, the best way to feed is so simple, it's easy to miss. There are powder ferts that you can place in the soil, then you just water and forget about ferts (unless it becomes obvious that you are seeing a deficiency of some nute). In your grow shop, you'll find these powder ferts, many by foxfarm like fruit and flower or happy frog. There are others like Dr. Earth brand, of which there are many but you only need one that is geared toward flowering or vegetables or all-purpose. The problem is that it can be difficulty to know exactly how much to give and how often. Growers easily get too much fert in the soil, then flush, then fert, then flush... you can see how people are just guessing at what to do. Powder ferts remove the guess work. You put about one half cup of powder fert in for every two gallons of potting soil and mix well. These ferts have most, if not all, the ferts plants need, especially if you consider that most potting soils come with their own ferts. You must use a specific brand however, meaning that LillyMiller makes a powder fert, but doesn't include any bacteria and fungi to break the stuff down and deliver to the roots. Dr. Earth has bacteria, so does Foxfarm's fruit and flower, so does Whitney Farms organic or all purpose. It's interesting that so many ferts are in liquid form but many don't tell you how much to give or how often. How is a grower suppose to get it right when you don't know how to use the fert? As far as your plant's condition right now, it's hard to know what to do. It's hard to tell how much fert is in the soil. I think if I were you, I'd like the go for a while and see what happens. Don't water too much, let the soil dry out some. Many times if you don't know what to do, the best thing is nothing.