nutrient problem please help

im growing 2 northern lights autos in 3 gallon pots with fox farm soil under CFLs. right now there 7 weeks and a cuple days. they r looking great flowering but i have a problm. at week 5 i started feeding them fox farm tiger bloom nutrients once a week. 2 times the firrst week. it starte discoloring the bottom 2 leaves but nothin serious but today after dark i truened the lights on and one fo the plants is very yellow and half the leaves are 50 % or more in a bright yellow. my ph is around 6.8 but i have no idea what i shuld do.....shuld i stop giving them the tiger bloom for the next 3 weeks until harvest? i water every 3 days and give the nutes every other watering...thanks alot please help i dont want them to die after all thsi work!!

take a picture so we can take a look at it and give you the best advice.

whats the NPK on tiger bloom. if you think the yellowing is from nute burn just stop using the nutes and flush it with a bunch of water