#glofish #algea #brownalgea #neontetra #help

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    Brown algae spreading on fish tank

    I’ve had this fishtank for a few months (20 gallon with 5 GloFish Tetras and 3 Neon Tetras) brown has been growing on it and we did a water change cleaning the glass but it came back, can someone explain what this is and how to remove it? I wanna get rid of it before it harms my fish