not lookin good

It looks to me like a nute issuse, PH give the leaves a different look. Almost a vainey look, if that makes any sense. How much and what kind of nutes are you giving? And what is your placement as far as the net pots to your water level? are they completely submerged, an inch above the water level?, because you can still droune a plant even in a DWC set up.
 
Check your aeration my man

might not be enough bubbles which leads to over watering

But i dont know that much about hydro so i cant tell you for sure my man , but the hydro guys can help you out for sure

Hydroponics / Aeroponics
 
It honestly does not look like a nute issue , hydro or soil

Just check out those hydro guys my man they will fix you up my man
 
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