Fox farm need help fast please

it looks to be mostly the lower growth, did you happen to splash any water on them while you were watering, or did they sit on the wet soil after you watered them for any amount of time?
the plants look pretty good to me, minus those few spots, but I don't think it's a big deal tbh, looks to me like you got something on them is all..
Hey when should I start giving nutes ? Should I wait till the leaves start to Turn bright greeen like they are deficient or what ?
 
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