Goldfish are one of the most common fish sold to beginners, but are particularly poorly suited to this role. The common Goldfish sold as feeders are generally full of diseases and parasites which may kill them and other fish they are housed with. Fancy varieties, which have been selectively bred for centuries to achieve their unnatural appearances, are subject to a host of problems associated with their abnormalities.
All Goldfish are cold water fish which do not do well in the lower oxygen levels found in tropical aquaria, and therefore should not be housed with tropical species.

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