What Protects Clownfish from Predators?

Castra, I was wondering what the anemone gets from the relationship.

This description is a load of rubbish. The clown fish is not immune from the anemone's venom. It has a layer of mucus on it's skin to protect itself. Also symbiotic means both creatures get benefits from each other. Mutual protection means that they protect each other, they don't. The anemone doesn't need the clown fish's protection.