They will not stop.
Nature, born in. Especially wild caught ones.
Tank bred are more likely to not host at all.
Best is to remove the Gonia and let the clowns find something else. They host in anything if they want to, pulsing zena, Pin cushions, hairy mushrooms, sinularia. These are normally ok with a clown clowning around. Frogspawn and Hammerheads do not like it that much.
Also the object of their affection must be at least double their size. Even with an anemone, too small an anemone and they could bother it so much that it struggles to survive.