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Stegastes variabilis
1-2 inch fish, The head and upper body is purple and the lower body and tail is yellow. Although, the yellow and purple both diminish into each other, so a small streak of yellow is at the head and a small streak of purple is at the tail. It is fast and slim. It has a few faded blue dots on the purple head.
Coral reefs, it likes to live around coral mounds for hiding.
Saw it in Bird Island Reef