Candace E
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Sea anemones, members of the phylum Coelenterata, are armed with venom-secreting nematocytes to aid in the capture of prey and to protect from predators. Most of these venoms are harmless to humans or induce mild dermatitis. However, a few species of sea anemones possess highly toxic venoms hazardous for humans. Phyllodiscus semoni is one of the most dangerous. semoni is commonly called "night sea anemone" and is distributed in the Western Pacific ocean; it is also called in Japanese "unbachi-isoginchaku," which means "wasp-sea anemone," in Okinawa (South Japan). The sting induces severe dermatitis with local ulceration and swelling that often takes months to resolve
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Imagine this: The clown fish didn't always have that protective layer of mucus. A series of adaptations provided for it, and through that it learned that it can hang out in an anemone without being stung, while other fish will purposely avoid it. Now, that series of adaptations was propagated pretty effectively, since the clown fish that had it were able to reproduce more effectively. The anemone was not designed for the clown fish, and it did not evolve so that a clown fish could "use" it. It evolved to sting things that try to eat it. The clown fish evolved to take advantage of that. I would also go so far as to guess that a butterfly fish was probably clown fish food long before clown fish took up residence in anemones. ADDED: I'm not a biologist, and you don't care enough about the answer for me to go and ask a biologist, and then relay it back to you with relevant sources. Let me tell you this much: I DO have some amount of faith in relation to this. I have faith that if you go out and ask a qualified, evolutionary biologist about this, they will be able to show you your answer, and back it up with a mountain of evidence. But you aren't going to do that. You don't care to know the answer.