I had my tomato for about four months before I got a bubble-tip anemone last month. He acted differently before he had a host. He tended to roam the tank more, and at night hovered under various rocks. As my ricordea started to get larger, the tomato would often cozy up to the ricordea, rolling around on it like he would in an anemone. The ricordea did not appear to appreciate the attention, though I don't think it was actually being damaged.
About four weeks ago I decided to indulge my personal desires instead of the conventional wisdom here and I brought home a bubble-tip anemone. I tucked it in a protected area on the sand and let it be for a couple days. The morning of the third day I checked the tank and was greeting with this rewarding sight:
Since then, the anemone has tripled in size and plumps its tentacles regularly during the day. However, it still doesn't have the
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like tips. I have heard sometimes they just stay roundish. The anemone never moved from the spot I originally placed him. Recently I moved the anemone higher up onto a rock and it has also stayed there without roaming. Either I have a very mellow aneomone or he has found life acceptable both locations I have placed him.
Now that he has a host, the clown tends to hang out within around a foot of the anemone. It's hard to tell the actual mood of a fish, but he certainly appears to love his bed. The one thing that was odd and frustrating at first was when I fed the tank. Not only did the clown not bring food back to the anemone, but if I fed the anemone, the clown would forcefully grab it away, even if there was plenty of food still floating around in the water. Sometimes he would grab it away and just let go of it and let it float away. Then ten minutes later he would snuggle up in the anemone, like an abusive boyfriend who doesn't even remember what he just did. Happily, I haven't seen this behavior the last ten days or so. When I shoot some food onto the anemone, he closes right up and the clown leaves him alone until the food is gone.
I think if you have a good established tank, you should go for it. I find that my clown acts completely differently now that he has a home -- much more like he would in nature.