Once you reach 500SP, you are 'officially' a minnow. Before that, you are plankton or redfish - that depends on whether you use Busy or SteemIt.
But what's in a name, right? A small fish is a small fish, lol.
I must admit I was shocked by the low number of minnows too. For some reason, I always assumed that number would be a lot bigger...
I thought there would be more minnows too, but it also makes me feel good to be among such few!