I saw this the other day and have no idea what is it. Has anyone got any clue? If this video has already been posted, I am sorry but I haven't been around for a while.

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Looks like one of those sea slug-like things to me.
Can't remember what they are called though, it's been a long time since I wanted to be a Marine Biologist.

its a danceing sea slug not really that interesting although that one is a funny coulor

It's either a sea slug or a deformed goldfish lol.

I think it looks interesting I've never seen anything like that before, thanks zrina!

It looks so cute!

It's a Nudibranch, a type of swimming sea slug.

Nudibranch! That what's it. One of many kinds of nudibranches easily captured especiialy in coral reefs or even sandy beaches!

Thanks for answering that capo never seen one of those before. This one was on the list of videos beside the topic video, does any one know what this one is?

http://www.youtube.com/watch?v=oew73zd914w...feature=related

Hm...not really wure what is that, because it can be on freshwater or saltwater. But anyway, should it's a saltwater, it's another kind of nudibranch or sea slugs. But if it's freshwater, big chance that it's a freshwater jellyfish. Although I seriously doubt my second opinion.

I think the first one might be a baby sea dragon instead of a nudibranch. IMO

Its either a sea butterfly, sea hair, sea angel, sea slug, sea dragon or a nudibranch according to comments.

I think the consensus has basically been reached that its a nudibranch.

I think the consensus has basically been reached that its a nudibranch.

I think the consensus has basically been reached that its a nudibranch.