08-14-2008, 11:39 PM
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KH and GH are carbonate hardness and general hardness. I would say the more important of these two is general hardness if you're thinking about Discus. Discus need very soft water in order to thrive.
Some people claim Discus are extremely difficult to keep and even harder to have them thrive and breed. Given the right conditions, as 1077 said, they aren't as difficult as many people make them out to be. However, they are known to be picky about their water parameters and tankmates have to be chosen carefully, so I would say for sure that they're not a good beginner fish. I would want to have a great deal of experience under my belt before I tried Discus, especially since they're expensive for freshwater fish.
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