Those may be wild clownfish and they might be imprinted on one type of anemone and will only host what they do in the wild. They may never ever be host to that anemone. I sold my previous pair because they would not go in any anemone and they would anoy the heck out of my corals to the point they were dying. Then I got some new clownfish.
My new clownfish are tank raised black ice, and they took only one day to go in the sebea, then I lost that bleached anemone and I bought another one (brown this time, not bleached) and they again took only one day to go in it.
Both my fish are occelaris and both time it was a sebea and both time it took a day or less for them to adopt the anemone:
Here is a video of my black ice in the sebae:
http://www.youtube.com/watch?feature...&v=A9HIwKpRjio