M. doreensis, the long tentacled anemone, is also a natural host to A. polymnus/saddleback. You do not need an anemone for the clown though. It will do just fine without an anemone. In fact, I've tried saddlebacks in my haddoni twice, and had to separate them both times, because the fish were to rough of the anemone. Todd actually had a saddleback die after going inside his anemone.