10-25-2012, 01:07 PM
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The goldfish alone will need at least a 29 gal tank just for swimming space and due to the large volume of waste they produce. Removing the goldfish will go a long way to reducing your ammonia problem. Plus, when it is fully grown it will probably make a snack out of the tetra and guppies. Average size for the common and comet goldfish is about 8 to 10 inches long, and the average size for a fancy goldfish is 6 to 8 inches long. That's more than large enough to make a snack out of small fish.