Can anyone identify this slug?

[AdamsReef]

Hey guys, recently I’ve noticed an infestation of these slug like creatures, I’ve noticed about 10 of them all different sizes on the back wall...
However, I noticed one on my livestock today and thought it was the perfect opportunity for a ID Photo!!

Many thanks guys.. please find attached the photos.

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[Brittle star 11]

Hi that is a stomatella snail they are good for your tank.