Hitchhiker anemone ID. not majono or aiptasia

[romsoccer12]

i have 3 things in mind
orange ball anemone
sun coral
Rhizotrochus typus ( http://reefcentral.com/forums/showthread.php?t=1792146 )

heres what needs ID'd
it opened up out of a hole in the rock last night and when i turned the lights on restricted back in.

 

[tgfrench]

its one of those small mushroom anemones

 

[romsoccer12]

bump

 

[SNAKEMANVET]

Thats a ball anemone,will get about the size of a quarter.