My first coral purchase and got this at no extra cost

[Buckeye Ken]

Purchased a pulsating xenia and dipped it in coral rx. This worm came off. It's about 1/2 inch long. Would love to know what it is.

 

[Reeffraff]

It's a juvenile sea cucumber.

 

[Buckeye Ken]

Thank you!

 

[F i s h y]

Could be a spaghetti worm with its tentacles drawn in. More likely than sea cucumber... considered a good part of your clean up crew.

 

[Buckeye Ken]

Interesting. I'll do some study on both of those. Thanks!

 

[Reeffraff]

Spagetti worms have all tentacles coming form the mouth region only. This animal has tube feet along its length. I am very confident that this is a cucumber. A pretty common hitchhiker on corals/rock. This variety doesn't grow very large (1-1.5") and there can be some variation in color and body shape (mostly the size/shape of the bumps along body). Here's a pic from a posting on another site: