PH Pen...soil grow...what do I do with it?

Plants are 43 days old started nutes about a week ago. Just started cal-mag tonight…didn’t know about it until I had issues…

This is what I was going to say
RO and distilled water, I was under the impression that these cannot be ph adjusted as they are as the have not got the minerals or something like that

I could be wrong but I’m sure I’ve seen that here

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