I've got this pink creature that came with my polyp rock. It has grown considerably over the few months I've had it. Every night it moves around the rock and yesterday it ventured off the rock onto the glass. I never actually see it move it seems to do it when we have all gone to bed.
I originally thought it was an anemone but after it moved i had a better view it seems to have a pink body with ternticles coming out of it's back. It has green/yellow tips... to the tenticles.
I've asked the place I bought the polyp rock but they don't know.
Has anyone got any ideas? If you do is it harmful?
I've attached some pictures.
This is a type of Nudibranch, a type of underwater slug with the gills on the outside. I photographed 12 species of these in St Kilda last summer; none of them were quite like this one.
My best suggestion would be Phyllodesmium briareum