What is this?

Jason

Nudibranch. Generally harmful.

Beth

Thank you, the rave is beautiful..., but it seems I will have to...

Wanda

It is most likely Flabellina spp. or Phestilla spp. It feeds on soft and hard corals, anemones. I can change it to something else.

Jeffery

but beautiful)

Chelsea

There is information that they do not live long in aquariums...

Lee

what is meant to be will be