Hi Warr - they are beautiful, aren't they? Most in any case that I have seen.
At first, they are anemonies. I can only presume that they need to be treat in very much the same way. Only difference being, that I can think of - that they do not require as much light as most of your bigger species of anemone's.
They also need to feed. And I believe that they can even eat a fish, if the fish is unlucky enough to "wander" into the tube anemone's tentacles....
I don't think that they have the tendency to wander, though....