You are definately experiencing an early stage of nute burn. There is discoloration at the tips of your leaves. What worked for me in the past is you want to begin leeching your soil. What that will do is flush out the nutrients that may be time releasing and also prevent a possible salt buildup which would ultimately cause a stoppage of your plants absorption of nutrients therefore causing stunting of growth or possible demise of your girls. Just make sure after your leeching use mild nutrients afterwards so it doesnt become a deficiency during the course of your grow. Note also some of your fan leaves are starting to taco up which is an indication of heat stress. Might want to reacess your distance of your canopy to your light source, see what your room temperature is when lights are on. Just be patient and good luck.some of the big fan leaves are curling up at the edges and showing a few signs of nute burn i think all help greatly appreciated cheers in advance.View attachment 2255193