Aiptasia? Please help ID

[Fieryfrog]

I have had this growing on the tip of one of my rocks for a few months. It has slowly gotten bigger. And now I am hoping it isn't an Aiptasia. I watch it and never seen ant long tenticals coming out of it. Just the small dark ones you can see in the picture.

Sorry for the bad Cell Pic.

 

[Fieryfrog]

I watch it and have never seen any*

Sorry for the poor english and typing.