be careful what you wish for.....
....I had a similar post about 1.5 years ago and let me tell you, once my clowns figured out that they could host, they never left my green BTA and the anenome went from huge to nearly dead in a week. In fact, I can hardly believe it didn't die! They rubbed in it so much it just closed up. I moved it to a corner of my tank and it's been well over a year and it still isn't up to the size it was. However, during that time the clowns still have hosted it, just a lot more gently. I think they have figured out the mutual benefit and in another 6 months, the anenome will probably be back to the size of day 1. Just one story to illustrate the time it might take. All the same, I hope yours does host, it's a pretty cool thing to watch in your living room. Good luck.