Clownfish and anemones were thought to be mutually beneficial before, but it turned out to be flaky, which was good for clownfish and bad for anemones, because anemones had stinging cells to attack other fish, and clownfish hid in it, so no fish dared to go in and bite it. Clownfish secrete special mucus, which makes anemones mistake for other sundries, rather than edible fish. Anemones, clownfish and anemones who bully amblyopia are food competitors because they have the same food objects.