Purple Anemone (Heteractis magnifica) and resident Ocellaris Anemonefish (Amphiprion ocellaris), AKA “clownfish" in East Timor.

The ocellaris clownfish (Amphiprion ocellaris) is a marine fish of the family Pomacentridae. Reaching about 110 mm (4.3 in) in length, the species may have a range of colors. After clownfish hatch, they initially reside near the surface. When they become juveniles, however, they move to the seafloor to find a host anemone, forming a symbiotic relationship in which they obtain protection in return for defense.

photograph by Nick Hobgood                  via: Wikipedia - POTD