Help with ID

[BCOrchidGuy]

Okay I've got an invert that's growing rather quickly. I'm not sure if it's some kind of sponge (seems to like light) No algae grows on it, it has a look and feel of very thin paper. It's water filled and if you wave your hand close to it, it will flutter (poor discription) as if it were air filled. It's a lime green/flesh colour. Any thoughts?


Thanks, Doug