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  1. Thebigcorycat

    Upgrade filter for more fish?

    I have a 20 gallon tank with about 10 small fish in it (3 danios, 4 skirts, 3 small cory cats). All the fish seem healthy and water tests are all good. I have a Marineland penguin 150 with the bio wheel filter. My wife wants to add like 3 more fish (little tetras), but I'm worried it'll start to...
  2. Thebigcorycat

    New 20g tank

    I used to have fish when I was a kid. Now I have kids of my own, so we got a 20 gallon tank. It been running for 5 weeks. Things are going okay, but I changed the filter yesterday and my nitrites are way up. I didn't realize having a healthy tank was so much work! I've since read here not to...
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