Mystery object, pest?

[seahorsecu]

When I got up this morning I noticed a weird, small, oval, snail-like thing without a shell attached to the side on the glass. I don't have a pic, but I need to know if it is a pest or harmful. Any ideas? :notsure:

 

[ryanhayes9]

sea slug?

 

[ryanhayes9]

see if you ca find it here....
https://www.saltwaterfish.com/vb/showthread.php?t=163870

 

[seahorsecu]

tHANKS, IT SOUNDS LIKE A HAMINOEA, I MAY OF SAW ONE OF THE "MYSTERY OBJECTS" ON OUR HUGE SNAILS THAT HAD HAIR ALGEA ON ITS SHELL!