Brown Spots All Over My Bottom Leaves And Some Of The Top

[ReDfALL]

I have no idea what this is since this is my first grow
Hydroponic at 5.8ph as well I need some tips on how to treat minor root rot

 

[Jack og]

Little nute burn and lock out, has the roots recovered?

 

[Jack og]

Ph is good, change water, what’s the water temp and ppm you been feeding, usually a week on cal mag it should recover provided root zone is staying cool