My kit has color charts and the Alkilinity is dead center of a scale showing that "normal" is 1.7-2.8meq/l. So center would make it 2.2 meq/l?
That 8.6 is a "solid" bright purple and I say 8.6 only because that is as high as it goes. It might off the chart.
my fish btw are behaving normally and feeding. The inverts are milling about discussing the primaries and the unusually high pH weather in there