I thought I would post a different kind of picture, this is a picture of the graph for pH and Temp. from my Neptune Apex Controller. I'm very pleased with the consistency and stability of my aquarium. Everyday looks like a repeat. (Knock on wood) This graph only shows the past 7 days, But it's been holding steady for quite some time...
I use the graph feature on my aquarium controller to look for trends. Like the one above would say to me alk is dropping over that period. Orp I use for general health and carbon depletion.