Nute burn

So I would first like to say hi everybody at rollitup.org, I am very new here. I am currently on my first auto flower grow. I have 400 watt hps cool tube. Im growing dinafem blue cheese in 3 gal pot. using ph water at 6.37-6.4 for the most part. using fox farm ferts. recently I overfed them/salt build up i didn't flush until i already noticed the burns.it happened really fast overnight basically. i know that this is my problem, I'm concerned if it will recover. In my past I have not ran into this problem, I am usually no too heavy on the nutes. I would just like to know what you all think?

.IMG_1015.jpgIMG_1016.jpgIMG_1017.jpgIMG_1014.jpg been stressing it.
 
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