Can anyone ID this critter?

[fixingstill]

Can anyone ID this critter?
About 10mm long. Looks like a snail but no shell and the body seems soft. It does look like a shell is being developed. It is on the back of the tank so I could not get a good pic. Next time it is in the front, I will try again. Meanwhile if you know what it is, please let me know. Thanks.

Baby sea hare? I have a sea hare in the tank.

 

[oneofmany]

Stomatella snail. (good)

 

[ReefsandGeeks]

+1, you're good to go

 

[fixingstill]

Looks like it. Thank you. It is amazing all these rocks and corals I got can carry all these little critters with them.