What the heck is this ugly thing?

[RiffRaff]

Looks like assail with out a shell. Is it a cucumber or nudibranch ofsome type? ITs eating algae off the back glass. I just need to know if I should get rid of it or not

 

[RiffRaff]

 

[josh1182]

looks like a slug. i have some in my tank, they came on some live rock. they are harmless in my opinion

 

[zero26]

Looks like a Stomatella snail. Good for the tank!

 

[reefergeorge]

Stomatella (sp) good thing. They sometimes release eggs in the water column witch is great coral food.

 

[RiffRaff]

Foes it look like a clear intestines shape?

 

[Nanook]

stomatella varia....good creatures to have. Usually come out at night time. Many fish find them to be a tasty snack.