Aiptasia and Mojano

I am sure there are tons of threads about these two pests already, but here is mine.



I have both anemones in my aquarium, both overtaking lots of rocks. Some more than others. They are everywhere. Before I really sink into getting many corals or large anemone that will roam around, I wanna take care of these guys.



I tried a Butterfly fish. He did not eat any of them. He also vanished some weeks after I got him.



I don't want to resort to a chemical either.



So what ways are there to take care of both anemones at once? I heard the Nudibranch that east Aiptasia will also eat Mojano. And of course a filefish, but my first filefish picked at coral.



Ideas please.