Stomatella Snail??

[Jcan]

It looks like a stomatella but is slightly different, having no antennas and almost resembling a baby sea hare. They are only in my refugium and don't seem to be in my display. They are certainly reproducing though with about 15-20 visible. Any insight would be helpful.
Thanks in advance!



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[this is me]

I was under the impression that stomatella snail has a soft shell. That doesn’t seem like it has any type of shell. Look more flukeworm flatworm ish to me.

 

[gobyvin]

That looks like a herbivorous sea slug. Check to see if they are mowing any algae I’m the five, then I think you can rest easy you have a cool useful critter.