The natural anemone hosts for
ocellaris clowns can be more difficult to keep than other anemonies. They are not usually recommended as the "first" anemone to be tried in home aquariums. Be especially picky if deciding to go this route...success is highly linked to the health of the specimen. Avoid all anemonies that show signs of bleaching, have been 'color dyed', or show any signs of damage - especially at the base (pedestal?).
Some people have had success with Ocellaris clowns and BTA's - both the green and red/pink varieties. It is hit and miss. We have a GBTA that are female clown hosted in after 2-3 months. The male has yet to take to it and we are approaching the one year mark...
Our anemone has struggled lately. Not sure if the clown is picking on it (nipping at the tentacles), or if it is some other problem. It continues to eat, and responds each day to the light, but its tentacles are receeded and it does not open up near as much as it used to. Trying to keep up with water changes, feeding, stable temperature, fresh carbon, and cross our fingers for the best. We keep a close watch on the clowns, our hippo tang, and for any other creatures that might be picking on it, but have not found any real offenders yet. It could simply be the standard "chemical warfare" with the softies in the tank. Here is a picture from a few months back, when it was thriving.
Ryan.