Spots couldnt find in plant deficeny guide

OKAY one of my plants and its the only one with the spots i have 6 Northern lights i dont thinks its a nute problem being there only two and half weeks old i had a previous grow gone bad due to me feeding them to SOON the pic on left is the Deficent one and the one in the right is Normal

thats a problem with the PH of you water. make sure that it is the correct range. (6.2.-6.5 range)

yours looks very high

i have it at 5.5

make sure your dripper is not dripping onto the leaves

Dont overwater your cube..