What is wrong with these plants. burn or diff??

i don't know what is going on. the first pic is blueberry almost 2 months old and the second one is OG 18 also almost 2 months old. both are in DWC. are these deficiencies or burn. im using gh nutes. the temp range is 75-80f. 1000 watt light about 2 feet away.. any help would be appreciated

they look a little burnt. have you recently upped the nutrients?

ide say nitigen defishent had my first crop do the same thing looks cool at first but no good add some nitrogen rich fert and it will recover in 3-4 days but those leafs are done will never heal, but your plants will be fine dont prune those until new leafs come in they be nice and dark green if you add nitrogen. most hydro nutes will require a nitro additive every two weeks or so. i use urine it all the rage and free delute 10:1 minimun and water with asap.

My guess would be a potassium def. possibly zinc or a combo of each.