help identify the beast

Larry

size 1cm, on the head like two ears of a rabbit. what kind of animal is this?

John

I don't even know what to say, it's an interesting creature, I've never seen anything like it.

Noah

This mollusk is called a sea hare.

Leah

Elysia.

Jesse

This Elysia seems flat, while my creature is round; could it be some kind of sea hare?

Christine

Maybe it's small and round for now, but it will grow into a flat one later?

Stephen

He's just FAT for you))

Yvette

Yes, I fattened him up)))

Leonard

Hello to all sailors! During the move, the stones were scattered, and with all the lights on, this one was noticed, caught, and placed in the sump. It constantly hides under stones or in the sand, loves the night. What is its name and what does it eat?