Are these rust spots? Cal mg deficiency?

[GreenMonkeyGrows]

Hey fam,
Just posted today in my blog and figured Id also post here. Is this cal mg def? Was my guess. But Im more often then not, wrong.
Cheers

 

[namvet25]

to small to have defiecency.Are you useing a ph meter and adding cal/mag?

 

[GreenMonkeyGrows]

I am using a PH meter. Its on point. And I only just started using Cal Mg yesterday.

 

[GreenMonkeyGrows]

After recalibrating PH Meter and checking again, lo, I was waayyy off. Back in normal range now and will monitor from here.