What just appeared in my tank?

[Sawacoral]

I’ve never seen this before. It looks like a snail with eyes, but I don’t see a shell. Currently I have two tiger conches and some nassarius snails. This doesn’t look like either.

 

[Sawacoral]

I found an empty conch shell. This thing is alive and is eating. Why would he be out of his shell? Can he even survive like this?

 

[Sumbub]

Does it have a hard shell? Could be a chiton if it is.

 

[Glenner’sreef]

Possibly a Stomatella snail. A good thing.

 

[Sawacoral]

Confirmed it is NOT my tiger conch. Both on the move now. Hard to get a good photo.

Does it have a hard shell? Could be a chiton if it is.

it doesn’t appear to have a hard shell.

 

[PharmrJohn]

Beautiful creature. Hope it's a good guy!

 

[Sumbub]

This picture makes it look more like a stomatella snail. @Glenner’sreef is right.

 

[KrisReef]

That is a nudibranch?

 

[goosemans]

I’m probably wrong but it looks like a baby sea apple?

 

[Steve and his Animals]

Hard to tell with blue lights, but it might be a small stomatella (as others have said) or a young abalone. If it was rounder I'd say it was a cowrie with it's mantle extended.