Brown spots during week 5 of flowing

[emfinite3131]

im on my first grow and they were looking good until about four days ago. im currently using ffbb and i havent nuted in a week and a half. fearing it was nute burn i flushed them out with store bought distilled water that i water with everytime. i moved the light up to about 24 inches off the plants i cut off most of the dying leaves at this point but some are still brwning up. should i give them any different nutes? should i try to transplant into a bigger pot because im only using 1 gallon ones now? can i transplant at this stage? any feedback is appreciated

 

[THE BROTHER'S GRUNT]

Yup sure does look like nute burn. How much water did you flush them out with? If you have them in 1 gallon pots you need to flush 3 gallons of water through each plant. You might wanna try another flush.

 

[emfinite3131]

ill try the flush again, i didnt use that much water for the flush the first time, ill try it today and see how it goes. thanks alot for the advice