Growing in soil? You might have nutrient burn! I water soil plant with nutes, then 1-2 times with just water, and as long as they look healthy and are thriving, I don't add anything extra.

too many times new growers get caught up in that, "Add nutrients to get more buds, and they end up burning up the roots...then the Bud turns to crappy weed...

Really should post pics, when you want advice on burnt or brown hairs, that you feel are unnatural...Otherwise, all you get get is somewhat educated guesses; Or not!
Peace