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pink slime airtube

  1. Worrying pink slime on airtube, dangerous or just dirty?

    Beginner Freshwater Aquarium
    Hello. I have a 30cm airstone in my tank, and regardless of my attempts to keep the tank nice and clean, the tube to the airstone always seems to get really slimy and gross. I know this is possibly regular and normal, however I was away for about a week and had someone else feeding my fish, so...
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