Clownfish or Anemonefish

Clownfish or Anemonefish

Clownfish or Anemonefish

Clownfish and anemone

The symbiotic relationship between an anemone (Heteractis magnifica) and a clownfish (Amphiron ocellaris)
is a classic example of two organisms benefiting the other;
The anemone provides the clownfish with protection and shelter, while the clownfish provides the anemone nutrients
in the form of waste while also scaring off potential predator fish.
Source: National Geographic