A Clownfish is a very important fish when it comes to anemones. They are like bees and flowers. The clown fish is the Host of the anemone and they feed them and keep the anemone protected and in return the the anemone doesn't sting the clownfish. Clownfish feed on small invertebrates that could harm the sea anemone, and the fecal matter from the clownfish fertilizes the sea anemone.