05-05-2010, 11:51 PM
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Xrayjeeper is right, goldfish do produce a larger bioload. However, a well planted aquarium (live plants) can help balance out the waste output of these guys because they use the toxic end of the nitrogen cycle for nutrients. I'm unsure of how much ratio of tank per inch of goldfish. I think that it is more, if not double, the standard for tropical fish. Okay here's a downside :( they are a cool water species of freshwater fish. This is a bummer I know to limit what else can co-exist, but the tropical species prefer water temperatures that aren't really compatible with gold fish.
The experts will see your thread soon and they will give you all the information you need, but i think they will likely ask more information as far as tank temperature, pH, etc., and probably species of fish if you know it (if not, maybe a close up of the fish?)
Poke around the forum and do some extra homework. I don't think anyone in the hobby knows everything and i find reading about it and learning to be worthwhile and enjoyable in the end. There are sure to be threads about goldfish and fish friends that get along with them. Another trusted website is www.liveaquaria.com