Is this a bad anemone or something good?

[BrettDS]

Initially I was afraid it was a manjano anemone, but now I'm not so sure. It came on my live rock. http://images.tapatalk-cdn.com/15/07/02/f84ecbf1069742638538ac4f256e2be2.jpg

[KingTriton1]

Gotta love all that diversity. :)

[AdamNC]

I got a few of what looks similar in my tank. Never move, never seems to cause an issue. I'd just keep an eye on it and it it moves, nuke it.

[tkeracer619]

looks like a ball anemone. could be a good thing