I have a pair of Ocellaris for about a year and they still haven't paired up. I bought the first one two years ago. Then a year later I bought a black and white one that was half the size of my original orange one. The orange one still chases the b&w one around a little bit, but never hurts him. My bta hosts the b&w, but my orange one has no interest in the anemone. What is the problem?