What is this? Good or Bad?

W

Westwood13

I have an aquarium that is two months old. Live rock and a few polyps are in it with a few hermit crabs and snails. I have an unidentified guest. It is a translucent white colour, about one centimeter in length. It stays on the glass and moves like a snail, but has no shell. I'd take a pic of it, but it is too small to show up on my camera. Any ideas as to what it is and what I should do with it?

Thanks

Westwood 13
 
There is definitely NOT a shell of any type. It has a short bifurcated tail, and it moves rather quickly for something so small. It also tends to hang out at the level of the sand but stays on the glass all the time as far as I can tell.
 
Hi,

Maybe a stomatella snail http://blogs.thatpetplace.com/thatfishblog/2010/06/14/what-is-that-in-my-aquarium-part-1-stomatella-snails/ or some kind of nudibranch http://emeralddiving.com/id_nudibranchs.html

Cheers,
 
I pulled one of them out this am and stuck it under a 10x microscope. It has a pale yellow center, but NO shell of any type. I dont think its a stomatella, or a nudibranch, unless it's a very boring looking nudibranch.

Thanks for looking and helping

Westwood13
 
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