Dying Leafs Look All Droopy And Falling Off

My plant use to be so healthy i had to of them i was flowering i put i think to much MG nutrients for flowering beauty and i think i put too much now the plants leafs are falling off like alot of my big fan leafs are fallin they were such nice femals there slowy dying i feeding plain water last night to see if it will come bk the big leafs and some small ones are fallin out

CAN THESE FEMALES BE FLUSHED AND BOUNCE BACK IF SO HOW LONG U THINK

root bound?

Pictures would help.