When the clowns are ready, if they ever are, they'll go to the BTA. Just like shifty said, they are not the natural host so it'll be hit or miss to get your clown to be hosted. I have a magnifica and I'm still waiting for it to host my two Ocellaris'.
Good luck!
Damn that's crazy lol. My two perculas ignored my handoni carpet but when I ditched the carpet for my mag they went in within minutes. Interesting that yours haven't since it's there natural host.