What are these ?

[Rmckoy]

While doing a water change , I found these blueish creatures under a frag .

What are they ?
Good or bad

 

[reef lover]

Chiton's I believe.

 

[SaltyCupcake]

+1, dorsal shell resembles chiton of some kind.

 

[andrewey]

Yup- looks like Chiton glaucus to me.

 

[Rmckoy]

Chiton's I believe.

I’ve never seen them blue or purple .
I’ve saw them many times Over the years and always wanted to get a picture .

 

[F i s h y]

Very unique color look like chitons to me to.

 

[najer]

Nice find.