need help sic plant.

hey guys this started i would say 4 days ago i stopped feeding and only been giving it a shit ton of water . ph 5.5-6.5 temps are 65-74f , using happy frog soil with advanced nutrients jungle juice 3 part solution, plant under 600w hps. thanks guys help a bro out.

can anyone help plz. need to fix asap, dont kno if its nute burn or a deficiency .