It looked like a patch of very dark algae until I saw it move tonight. It moves like a snail (hoping it's not a monti eating nudi) and is as flat as a shadow. It seems to have a shell in the middle but it's foot is thing and a mantel appears to be all external. Two short black antenea and it moves pretty fast. I think I saw two which probably means 500. I've recently noticed a huge hatch of normal looking little snails on the reef but these guys must have been here a while.
ID and recommendations please.
ID and recommendations please.