WHAT IS THIS IN MY TANK??

[TMH27]

Noticed this in my tank a few days ago, at first I thought it was a head small piece of coral that had relocated it self, then last night I watched it crawl across my rock.

From close up photos/videos I can't tell what it is. Looks to have antenna, and maybe 2 spiral shells. I haven't got a clue what it is.

I havnt added anything new to the tank in around 2 months, I haven't got any snails. Only 2 clowns and 1 blue hermit

 

[Aiptaisia anemone]

lol your camera got astigmatism. Anyways i think its colonista snail.

 

[Paul B]

Don't worry. I have about 7,972 of them.