Also, the first couple starters can throw you because they do not have much visible activity.
I did a trappist starter a couple months back and I could not really see any activity. BUT, when I aerated my wort in the carboy prior to pitching, got a couple inches of foam on top and when I pitched the yeast the foam turned into krausen without ever going away. It was that fast.
I am generally a high krausen pitcher which mean that sometimes you just have to take on faith that the yeast is viable and just having an orgy of a time in that starter even though sometimes it is not obvious.
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