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![A typical school of the surgeon fish, Acanthurus olivaceus, grazing on algae during the time when filamentous algae were abundant reef0172.jpg A typical school of the surgeon fish, Acanthurus olivaceus, grazing on algae during the time when filamentous algae were abundant](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_reef0172.jpg?itok=-WuHIfXf)
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A typical school of the surgeon fish, Acanthurus olivaceus, grazing on algae during the time when filamentous algae were abundant.This period occurred soon after placement of the pipes and the redand green filamentous algae were replace with blue-green algae at a later stage. (Image credit: Dr. James P. McVey)