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purple alage

  1. Weird purple algae/cyanobacteria/something - Help!

    Freshwater and Tropical Fish
    So I've had my little 3 gallon betta tank running really well since December. 1 betta, 2 nerite snails, and a marimo. Did 1/4 water changes about 1 time a week and 1 time a month did a bottom suction (which was about a 1/3 to 1/2 water change depending). Tank basically ran itself. I moved to...
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