the best thing you can do is literally soak the plant free of any nutes. and let the plant compleatly dry out in the soil only 5% moisture then re water as normal. if you havent already got nute lock. this will work mate.
just run water through the soil for about 10 secs compleaty soak it as to was all the nutes through and out the bottom, the leave until compleatly dried out like dry in the middle of the soil. thatll sort it! i put money on it lol