help me please somebody !

First I'm growing hydro with a supercloset..... I'm on day 25... all was well until a couple of days ago... the leaves started yellowing and and drupping and turning under... I noticed this after pumping up the ppm to 700 from 450ppm .... am i over fertiliting they ? the temp is steady around 85 to 88 with the humib at 45 to 51.... no Co2... someone help my plants are dying I think ?

Mute defficiencies most likely hydro setups when left unbalanced can damge plantS quickly now that u corrected a bit hope that perks ur plant up check daily, hourly whatever but check often you ppm.