what is this

[Reefkeeper14]

I got some live rock probably close to a year ago and this little guy came with it. he is orange with a gray back the looks similar to a shell. he used to be completely orange but when i moved him into my 210 his gray back started showing. hes never bothered any corals and he is really cool and eats algae really fast. does anybody now what he is
Thanks

 

[KLR]

It is a limpet. However I am not sure on the exact name under the general name limpet.

 

[ritter6788]

+1 Limpet

 

[nova65ss]

Scutus I believe.