Runoff in coco with perlite

Hello guys today is officially 6 weeks. Thank for all the advice. I checked my runoff and the ph was 5.3. I’m using GH nuts the ph is 5.8 and ppm is 980-1000 is that ok or does my runoff have to be higher

In coco and perlite you want the runoff pH to be ~5.8.

Thank you can you recommend how to increase the ph I’m following GH schedule my EC is at 2.0 and ppm from 950-980 that is where it should be by their mix