Mushroom of some sort?

[WayneswalesUK]

 

[AtoZ Cichlids]

I know little about reefs. But it looks like it has the foot of an nem.

 

[bribo12]

Looks like a ricordea mushroom or hairy rhodactis mushroom. Not a nem though as mushrooms have the foot too

 

[WayneswalesUK]

I thought it could be a ricordea of some sort but just not sure. It's mouth is wide open all the time