Flowering brown leaf tips

I am growing Strawberry Cough. I am in between week four and five in flower. the fan leaves are turning brown and the other leaf tips are brown. I screwed up a couple weeks ago and added Flora grow instead of Bloom. Maybe this is why. I am now giving Flora bloom with every other watering. Buds are growing but I'm concerned about the leaves. They're really starting to smell like marijuana. Do I not need to worry or what should I do. This is my first grow

Because they are not getting any N; bloom is like 0-5-4. One of the biggest myths about cannabis is that they only need N in veg and P & K is for bloom.