Purple veins

Came home to this on some of my older fan leaves. PH dropped down to 4.7 so I've got it back up to 6.1. It's been dropping like that every day. The last few days, when I check it in the morning it's like 4.9-5.1, I will get it back to over 6.0, then when I get home from work it has dropped again just as low. Anyone want to weigh in? New growth seems to be doing fine.
 

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