First grow! Help identify deficiency plz!!!

Please help me identify and fix this deficiency on my plants! Dwc, ph 5.8, ppm 450-500, temp 73f, humidity 50%. First grow ever!!! The strain is wedding cake s1(seedsman).

What are you feeding them? How certain are you on the pH?

CannaCountry said:

What are you feeding them? How certain are you on the pH?

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I’m feeding em GH expert series! Im
Checking the ph with BlueLab PH monitor Connect with auto doser!