Looks like a snail with out a shell but moves much faster almost as fast as a nasarius. I have looked through the hitchiker gallery and no luck got any ideas or links i can check out?
That would be my guess. I'm trying to catch the one in my tank, so I can take a great pic of it in a container to place in the gallery. Do you mostly see it at night?
true... a good thing to have, if I remember they eat film/small hair algae and various other algaes. good thing to have, good thing there not rabbits or you'd have a tank full of bunnies!