sea slug? good or bad?

[rambler67]

well while cleaning my power heads i took one of the heads out there was what looks like a slug on it. i was wondering if it is good or bad?

 

[Widdy]

Stomatella snail. Good.

 

[rambler67]

Thank you now i can put him back in.

 

[dubs]

1+ they eat algy

 

[ScorpionSys]

Is there a shell on it? Its hard to tell it that is a Stomatella or not.

 

[dubs]

The shiny thing next to the finger is the shell its def a stomatella

 

[rambler67]

Yes it has a shell from all the pictures I found it is a stomatella.