What is this?

[JCM]

I had thought this was a sponge growing on my KP aquatics rock, but I noticed today that it's mobile. Any ideas? It's a bit bigger than a quarter.

 

[JCM]

Answering my own question as I posted before researching. It's a fleshy limpet.

 

[Zach B]

Good work! Good part of the clean up crew

 

[JCM]

Good work! Good part of the clean up crew

Super cool creature! I've had the rock for a year now and just noticed it today.

 

[Zach B]

That is awesome! I recently found a baby stomatella and astrea/ninja star snail in my fuge We have no big ones so they must have hitchhiked somewhere and made it past dipping of corals