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white stuff

  1. What is this white stuff?

    Beginner Freshwater Aquarium
    Hey everyone, My co-worker has a 5 gallon tank for her daughter with a couple guppies in it and they noticed white stuff floating on the top of the water recently and we're trying to figure out what the heck it is. It's hard to see in the picture, but there's more little white particles of the...
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