Resolved Good or Bad?

I saw this about 2 weeks ago when I was moving a coral in my tank.I saw it again last night after lights out but could not get to it fast enough-tonite I caught it.It is a slug of some sort and is actually very fast.It appeared to be eating algea on the back glass of the tank.If anyone can help that would be great.It is currently in my sump in piece of return line with screen over the ends.If I can I would like to place it back in the tank.
Thanks in advance.

 

I can't zoom the pic in, but it looks like stomatella varia to me.

Harmless algae grazer if that's what it is.

 

That is what it looks like.Thanks for the quick response.Sorry about the pics-new to the forum thing.

 

That's OK, Welcome to 3reef

 

yup i agree with tom on that one

 

I do too, stylaster

 

dang glad to know you are a sarah now, but im getting beat up for it LOL

 

What do you mean?

Ya, my username serves a purpose. It's meant to fool the perverts, and other's that can't seem to grasp that a woman can be just as knowledgeable in the hobby as a guy can.

 

i was just joking, and yes you have been very knowledgeable good job too