What in the world is the critter I just saw in my liverock?

[RussC]

I just saw something I've never seen before. Its a critter. It has antennas. It moves kind of slow and looks kind of like a slug or a snail. I never saw the entire body, but what I saw looked grey. But what caught my eye was what it was doing. It would contract. And when it contracted it blew "smoke" into the tank. It was like it was exhaling smoke in puffs. It was strange. it did it at least three times. It was so unusual. Then I'm pretty sure it saw me and retracted into the rock.

PS Just got a new coral today. I'm wondering if this came in on the new coral. It was in my existing rock right next to the new rock the coral is attached to.

What in the world is this thing?

 

[RussC]

Update: I think its a stomatella snail. I did a quick search of aquarium pests snails slugs and that photo popped up. I'm pretty confident thats it and what it was doing was releasing eggs/sperm into the tank.

Anyone with experience with these things?

 

[nfrench2100]

Did it look like this?


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[mcgyvr]

^^ yep thats a stomatella if thats what you saw then they are harmless and beneficial grazers..

 

[RussC]

I only saw the head, but after seeing many images online I’m pretty convinced that’s it. It was so strange when I first saw it.