Thanks over all they look good to me after doing some research I think it night be nute burn the last time I watered them my ppm was at 500 my feeding chart says it should be at 1300 for this stage I added more nutes ended up at 900 I didn't want to over do it but I think I dida few more details and pic's of the overall plant would help....without additional info, we would only be guessing.
might be the start of a cal-mag def.....but that's just a guess
Yes I doAlso. Do you water with the lights on?