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Old November 26th, 2009, 09:15 PM
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Marcha Marcha is offline
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Join Date: Aug 2009
Location: Greater Victoria, BC, Canada
Posts: 510
As far as I know, it's simply the huge amounts of poo that a goldfish generates, resulting in an extortionate amount of ammonia in the water. Tropical fish are very sensitive to ammonia levels, and a tropical aquarium would require a pH kit for that reason (to test the pH levels of the water every week or so). You could use a pH kit with a goldfish so that you can find out what works best for your goldfish regarding substrate, filtering and oxygenation.
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