A few years ago we had an ocellaris in a 10g tank with no anemone. There was some Xenia, a small torch (one branch about 1" across), a ricordea mushroom, and a few other small corals. Nothing that could eat the fish. It disappeared one day. It had been perfectly healthy when I fed it the day before. We could not find any trace of it. It wasn't on the floor. There was nothing else larger than an amphipod in the tank. I took all the rocks out. We never found it. I stillhave no idea what happened to it.
Dave