Looks like it's just on the top leaves, could be light burn. Looks like it could be nute burn too. Is it like that just close to the lights or throughout the plant?
Thanks all Its nute burn ok will add some humate and fulvate with flush over next couple of days then will half the nutes
yea i think half nutes will be ok .plant looks like its had plenty of N in its feed ..all the best with your grow,,,mac,
