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The picture shows a Cardinal Fish getting caught by the Giant Carpet Anemone, which is the bubbly green/brown thing. The Anemone usually play host to Clownfishes. The Clownfishes uses the Anemone as protection and does not get eaten.
The Anemone uses its tentacles (bubbly looking thing in the pic) which have specialised stinging cells called nematocysts to immobilise their prey (in this picture, a Cardinal Fish) so that the tentacles are then able to move the food into the mouth.
''Stichodactyla gigantea'', commonly known as the giant carpet anemone, is a species of sea anemone that lives in the Indo-Pacific area. It can be kept in an aquarium but is a very challenging species to keep alive and healthy for more than 3–5 years.
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