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sludge

  1. Jop371

    What algae is this?

    Hi all, I've recently set up my Dennerle 20L nanocube, 10 days later I'm finding clumps of brown sludge clinging to the plants and wood. The lights are currently on for 8 hours a day and I'm currently injecting co2. Does anyone have any idea what kind of algae this is and what is causing it...
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