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green algae

  1. 20 gal acrylic tank with green algae issue

    Beginner Freshwater Aquarium
    I have had aquariums for years and have never had issues with green algae. I only have a couple of tetras in this tank. I previously had a single betta in there. I had the algae problem then too. I completely emptied the tank after the betta died and started over with the tetras and the...
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