Probably one of the most recognizable symbiotic relationships in nature is the clownfish living within a hosting anemone. Not all anemones are natural hosts to clownfish so care must be taken to pick an appropriate anemone if that is the goal. Certain species of clownfish are almost always associated with one or two particular species of anemones in the wild, so pairing the natural host with the right clownfish helps insure the clowns will live in that anemone.
Bubble tips anemones are the most commonly available hosting anemones and can be found in green, rose and many unique variations like sunburst.
The carpet anemones include Stichodactyla gigantea or true carpet, Stichodactyla haddoni or saddle carpet and the largest of all the anemones Stichodactyla mertensii, or mertens.
The second largest anemone in the wild is the Heteractis magnifica or Ritteri
Other anemones that host clownfish include Macrodactyla doreensis or Long Tenticle, Heteractis malu and Heteractis crispa - Sebae