ID this 3' Red Bubble Tip Sea Cucumber?

[gweeto]

I picked this up a week ago.
I normally don't get things without research but this thing seemed really rare.

Figured cant be too bad as a filter feeder in an empty tank.
check it out here

I have a feeling it wont live long in captivity

 

[ClownNut]

medusa worm, usually you can find a emporer shrimp with it.

 

[Elysia]

Its a cucumber, frequently known in the trade as a medusa worm, as Clown Nut mentioned. I live near a larger saltwater fish store (esp. for the mid-Atlantic), and they often have these in stock.

 

[Monkeyfish]

Medusa's are toxic and can wipe out a small tank when they die or if stressed.