HEEEELP

Hey how u all doing

I NEED HEEELP

i have some plants which i did the run off test and the ph was 5.2-5.5-5.3 and the ppm was way to high but the ppm and the ph input was 6.5 and 1.2 Ec... this was when plants was week 2-3 veg

i did flush all of them with just water to bring the ppm and the ph when i wanted but the ph wasn't changing while i did bring the ppm lower

after that the plants got worse i think becouse of the overwater and right after stars problem with magnesium deficency i know that by purple steams and yelloing between the leafs but the veins was staying green

i fed them with epsom salt in 500ppm

and tried that spraying on the leafs as well

the color is now light green but they look so droopy i dont get it like i tried to do everything on them im so tired like i cant sleep at night

temp is perfect not too hot not too cold air flow is perfect

i did a run off test on one of them and the ph input is 6.5 the run off is 5.7 and ppm i feed them one time with 1.8 Ec then after with epsom salt like i said

i relly need help is making me feel so bad man i love doing this job but it just i dont know what else to do