Warnberg said:
Most wild caught clowns will adapt to anemones much faster than tank raised ones.... JME I have also observed that all clowns will take to just about any host as long as they find it suitable....
Unfortunately some of the hosts that clownfish can take too don't like having fish brushing against them all the time and some anemones have been known to eat the clown that's trying to find a iome. Condy's come to mind here. Any anemone that comes from the Atlantic ocean will not host a clownfish no matter how hard the clownfish tries.
Clownfish don't need to have any animal host them. They can live a full and healthy life without something hosting them. Before you get any type of anemone, make sure that you have the system they require as they are very difficult animals to keep healthy long term.
Also the list that Woodstock posted is very similar to the listing from Joyce Wilkersons "Clownfish" book which is reputed to be one of the best resources for information on clownfishes. I know that I really enjoyed reading the book and learned a lot from it.