Green Algae | Chlorophyta spp.
Green algae are unicellular organisms that use chlorophyll to perform photosynthesis and appear green. These organisms can look like green paint in the water, scum, or filaments. Although they are unicellular, green algae can form thick, dense mats on the surface of your waterbody. They are the primary producers in the water and are necessary for a healthy ecosystem, but can quickly grow to nuisance levels.