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![In general, most microorganisms are too small to be seen with the naked eye reef3877.jpg In general, most microorganisms are too small to be seen with the naked eye](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_reef3877.jpg?itok=xIo_eLDl)
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In general, most microorganisms are too small to be seen with the naked eye.However, these tufts of filamentous cyanobacteria form large accumulations ofindividual microscopic cells that are visible. Cyanobacteria often form largeaggregations that produce toxins and are detrimental to marine organisms andhumans, collectively called harmful algal blooms. (Image credit: Twilight Zone Expedition Team 2007, NOAA-OE)