What eats these? Or how do I get rid of?

[KustomAquarium]

Found this pic in another post but can't seem to get a definite answer. Are these Medusa worms? And how do I get rid of them and or what eats them?

 

[xjiang7]

Looks like a sea cucumber

 

[JasonK84]

Medusa worm yes. They are good. You can ship them to me!