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  1. Advanced Freshwater Discussion
    I have two tanks a 20 and a 29 gallon which have been set up for about 7 months. About a week and a half ago, out of nowhere, my 20 gallon tank began to stink. It was like a rotten egg odor that filled up the entire house. Desperate to get rid of it I did an gigantic water change and gravel vac...
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