What is considered stable for PH?

[Benj2112]

More of a general coral question, but I am wondering how rather quick 0.1 fluctuations in PH would effect corals. In the winter my PH is very dependent on my skimmer running with a CO2 scrubber attached. During feeding that turns off and I get these quick drops and then slow recoveries with the skimmer turned back on. Would two daily quick 0.1 PH drops be a problem?

 

[Bryce M.]

I would say no, slight variation would be fine, I'd be okay with the .00's but the .0s might be fine?