Banded trochus baby??

[jmags080307]

I have 2 banded trochus snails in my 40 gallon breeder and I found this in the filter sock in the sump. Is it a baby??

 

[Irsug1]

Is it relatively flat? Looks like the disc from a turbo Snail.

 

[jmags080307]

When I took it out of my sump there was a small snail like looking thing in it and it's now attached to that rock.

 

[Rinopirate]

Looks like a limpet to me. I get them in my refugium

 

[cromag27]

Limpet.