actually they are an anemone not a worm, but are dirrectly related to sea anemones and corals. Easy to care for, feed them some shrimp every now and then and keep them out of really high current. They like moderate current. Note: they sting virtually everything, so keep them away (far away) from other corals. Their sting is potent. In addition they can eat fish like mandarins, pipefish and seahorses or anything that blunders into their tentacles. Absolutely gorgeous thought. I once saw an aquarium that had lots of tuffa rock with holes drilled into it for two inch diameter pvc then two inch pvc tubes capped on one end and filled with find calcareous sand. In these tubes (it was a 55 gallon tank, I think their were fifty tubes or so) were every color of tube anemone that I can think of, even a few cool neon green ones. Amazing, it looked like an alien landscape. The only problem was the owner really had a hard time keeping fish in the tank as the anemones pretty much filled the water with their tentacles. He eventually kept a variety of shrimp and a few rather tough fish (I beleive they were fridmanis but it was a long time ago). Amazing tank.
