Any anemone has a chance of moving around your tank, and they have varying degrees that they would affect coral that they may come into contact with.
Figuring out what species it is is pretty important. If you can't ID the anemone you can't be sure if your system can support it, or even if it's healthy to begin with. I would guess it's a condy/haitian reef anemone or sebae but no way of knowing without seeing it.