ID assistance please

[ralquist]

Been trying for a while to figure out what this small circular shaped thing growing off the side of an old frag plug on a mixed Zoa rock, been there for a long time (2 of them). Tucked in a back corner and hard to get to the glass maintenance, sorry for the junk photo but maybe someone out there can help. Has grown, specs of yellow/green but almost translucent with a yellow/green outline. Has tentacle/skirt/stingers that are translucent with white round tips. Any help or direction would be great! Not hurting anything and have been there over a year, just curious.

 

[Crabs McJones]

Ball anemone

 

[ralquist]

Ball anemone

Quick and spot on, thank you!

 

[rayadog]

I have found that they tend to walk towards darker areas fwiw. Mine hide under a number of different rocks for a LONG time, to sort of out in the open, to finally in filter compartment.

I think they’re neat.

Edit: oh that’s awkward, I didn’t see this was from July!

 

[vetteguy53081]

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