I think there's a little confusion here...or if not, I'll add some.;)
If you follow that link, that "beaded anemone" comes from Puget Sound where the temps are in the 50's. It wouldn't last a week in our reef tank temps.
You are thinking about the tropical "beaded anemone" heteractis aurora, which I highly doubt that's what you have. I don't think you can get any heteractis.sp that small.
My guess would be Epicystis sp.
Anemones