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What is also noteworthy is there is evidence of some diatom "algae" as a green colored slime like algae instead of the much more common brown diatom algae that is a common problem with new aquariums.This has been called "Green Snot Algae" (scientific name Didymosphenia geminata) and is becoming more common in streams just under the surface and/or covering rocks (pictured to the right).FORWARD: This Aquarium Answers article (post) is not intended as a complete algae control article, but is intended to address the types of algae that I receive the most questions about which are Brown Diatom Algae, Freshwater Thread/Hair Algae, Black Beard Brush Algae (BBA), and Marine Hair Algae aka Filamentous marine algae (I address other algae as well in this article).I will add to and update this article as well over time.Diatoms are a major component of plankton, free-floating microorganisms of marine or freshwater environments.
The bottom line is I do not claim that this article is the "end all" for algae control, but I do think the majority of readers will find this article useful, often with information not found elsewhere.
Brown Diatom Algae are dependent upon silicates and high DOC (dissolved organic compounds) in the water and thrive in conditions where the minerals and Redox are out of balance.
Brown diatom algae also out compete more desirable green algae in these conditions when light is poor for healthy photosynthesis due to lack adequate amounts of light in the proper PAR.
The yellowish-brown chloroplasts within Brown Diatom algae are what give this “algae” its typical appearance.
Brown Diatoms are found in fresh and saltwater as well as soil.