I've had a Pachycerianthus fimbriatus(?) (which is actually not a true anemone, but actually a worm) for almost 2 years now. When I first received it, it was the size of a 50 cent peice. Now the tentacles can reach over 6" in length. In my opinion, they're quite hardy. Mine survived two temperature spikes and an ammonia spike. They do contain zooxanthellae, meaning that they will need some amount of lighting. Most Power compact or VHO lighting should do fine. They will get the majority of their nutrients through feedings. If you feed your fish regulary, you shouldn't have to worry about feeding the tube anemone directly. They will catch the food that you feed your fish. If you wish, you could spray some brine around the worm to provide it with some extra food.
Graham
PS. Heres mine: