Help Identifying a leaf issue

[Basic]

Can anyone help me identify the issue that is reflected in the leaf coloration in the attached pic? I'm growing in Coco Coir. I tried boosting my CaL Mag Supplement but the issue seems to be progressing.

Thanks!

 

[OldManGrower]

While I'm not an expert the easiest diagnoses is PH issues.

 

[Rwise]

Root issue (PH) not enuf info.

 

[Basic]

Thanks for your comments. I've been setting the PH of my water around 6.0.