Need id on this weird thing!

[Wizard4s]

Can anyone I'd this? It's just underneath my mushroom coral, it has little tenticles or feet all around it and it moves, I've never seen anything like it.

 

[Convict2161]

Can anyone I'd this? It's just underneath my mushroom coral, it has little tenticles or feet all around it and it moves, I've never seen anything like it.

Kinda looks like a leg of a brittle star fish.

 

[Wizard4s]

I don't think it's that, the whole thing is circular shape and is green/purple colour

 

[Sniperhank]

You are sure it moves? I'd want to say it is a blasto or something similar.

 

[Wizard4s]

It looks like it does, I I tap on the glass it looks like it clamps down on the rock

 

[Convict2161]

A worm of some sort? Have you googled saltwater hitchhikers? There's like 300+ I forget the name of the site but its pretty good with lots of pictures etc

 

[Wizard4s]

Ok thanks I'll take a look

 

[Wizard4s]

I've noticed it opens from one side it looks a bit like a Venus fly trap

 

[Leonardo7689]

Oyster or some kind of bivalve IMO