Oscellaris will host Haddoni carpet anemones. Orange or Black/White variants. They need time, because the sting is more potent they initially nudge it to expose themselves to the stinging cells. Their bodies build a natural slime coat. All clowns are not immune to the sting, it is the slime coat that "protects" them. Their bodies have the ability to adapt to the host, unlike other fish. Now, I had to juvi oscellaris that dove right in to a healthy haddoni, that didn't end well for them - they were nearly a snack. They had white stinging cells all over them, would not go back for over a month. Alas, it is natural for them to host and they did go back and ultimately hosted.