ID please

[JetStarheart]

There are at least 2, slow moving and hard. Stay on the live rock

 

[Intricateart]

That's a Chiton, they are harmless algae eaters. And kinda neat. There are hundreds of known kinds. To see the gnarliest ever, look here-
Chiton - Wikipedia, the free encyclopedia

 

[sageharmon]

They Taste good too

 

[Mike J.]

LionfishLair.com - Hitchhiker Guide to your Aquarium

 

[Intricateart]

They Taste good too

I saw Andrew Zimmern eat some on an island once, he thought so too :)