whats wrong with my plants?

[will316]

can anyone tell me what this is please

 

[northern monsta]

I had the same problem by the looks of things on your pics it looks like nute lock out of some sort i put all my girls on hydro and changed nutes a week later-2 weeks everything looks 100% better infact 200% im not the most qualified to tell u exactly whats going on but im sure some1 will chime in with some help for you, i think maybe u should post in the infermary people will answer u quicker check your ph, ec and temps there the basic things to check and tinker with peace .........The monsta

 

[hubcap]

feeding them yet?
also,might be time to get em out of the cups....

 

[Peks]

maybe is a ZN deficiency. Give more info about the plants, so we could help.