Brown Diatom Algae Care Guide
Bacillariophyceae sp. · Freshwater algae
What Brown Diatom Algae look like
Dusty brown film coating glass, substrate, plants, and decorations. Easily wiped away, leaving a brown residue. Individual diatoms are microscopic with silica cell walls.
Behavior & temperament
Extremely common in newly cycled tanks. Feeds on silicates present in new substrate and tap water. Typically resolves on its own within 4–8 weeks as silicates deplete.
Diet & feeding
Photosynthetic autotroph requiring silicates for cell wall construction.
Behind the name
From Greek 'diatomos' (cut in half), referring to their two-part silica shells.
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Brown Diatom Algae?
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