What is this?

Jason

Nudibranch. Generally harmful.

Beth3383

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

Wanda666

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

Jeffery7866

but beautiful)

Chelsea567

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

Lee425

what is meant to be will be