Any Ideas?

[FlyingW]

I'm running dwc and starting week 5 of flower. Any idea what might happening to the leaves? Thanks. Ph 5.7, water temp 68 degrees, room temp 78 degrees,

 

[FlyingW]

Do I have a big problem?

 

[Scottylikesbud]

No your ph is good, are about half your roots above water? In hydroponics I’ve read plants thrive because the top roots are able to breathe in all the air freely. And I myself notice my plants roots look healthy with 2 gallons in a 5 gallon container.
or it can just be nute burn. lower strength