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'''Heteractis magnifica''' (known variously as 'magnificent sea anemone' or 'Ritteri anemone') is a species of sea anemone that lives in the Indo-Pacific area, and can grow up to 1 metre (3 feet) in diameter in the wild. It can be kept in aquaria but is considered one of the most challenging species to keep healthy. They require very strong lighting and very high chaotic flow. They will not survive in tanks with any presence of nitrites or nitrates. If they are healthy and kept well fed they will grow very rapidly. ''H. magnifica'' consumes both vertebrates and invertebrates, including fish and crustaceans.
It is often found in association with anemone fish, or clownfish, such as the cinnamon (''Melanopus''), Clarki (''Clarkii''), false Percula (''Ocellaris''), Maldives (''Nigripes''), Percula (''Percula''), and the pink skunk (''Perideraion'').
''H. magnifica'' was featured in the Pixar Animations film Finding Nemo.