What is this new critter?

[Euphylliaphyle]

This is a Ball anemone and harmless. Unlike aptasia and Majano, I had one 2 years ago and it remained, had nice color and only one more ever emerged. They remain small and here is a puzzling fact as others stated they are a good anemone. Anemone ???
Ball Anemones are actually not anemones at all, it is actually a mushroom coral that is commonly confused by too many as a Majano Aiptasia. Unlike an Aiptasia, they are reef safe, they commonly stay closed during the day and open up at night. The tips if its anemone-like tentacles end with a ball tip giving it its' name

Thank you! Good to know. I think they are quite nice looking and look forward to having them around!