What is this ?

[KCD1803]

This is not my photo, but I have a few of these guys who recently appeared on my rocks...good, bad, what do you think and what are they?

View attachment 342945

 

[D-Nak]

Looks like some sort of Strawberry pseudocorynactis anemone.

 

[ulli]

Ball tip anemone.

 

[Dkuhlmann]

Its really cool seeing it on your snail. I've got at least one of them in my tank, I think I found another today but it's really hard to see it where it is. Beautiful critters