Ideas-tricks to get designer clowns to host anemone

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I had the same issue, then bought a black clown with an anenome. The new clown went str8 to an rbta I had in the tank, then the 2 went to it also. Unfortunately, they appeared to push the black one out & it eventually died ?
Not too sure why/how though, I never really saw any aggression nor injuries. It was as if it was depressed. Now the 2 original clowns host the nem (that I bought with the black clown) all the time.