Help I.D.

[denniss]

I need help in identifing a worm like creature. Its about 3/4 of an inch long 1/8 in diameter and moves on the glass like a slug or snail.Its white in color and has 2 horns on its head.I saw a couple of smaller ones too.Can these be harmful .Please let me know.

 

[fishking]

does it have a little shell on its back that resembles something like the shell of the clams we eat, if so its a stomella snail

 

[denniss]

From what I could see it had no shell at all.

 

[dan lang]

do u have any nudibranch because it sounds liek one but i have no idea without any pics.