08-27-2008, 02:45 PM
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Your best bet is to google it and read all the technical data about it. Took me a few times and a few questions to get it all down.
Basically, the main point of carbonate hardness, KH, is to keep the PH from making wild swings. The higher the KH, the less chance your PH will swing. In your case, your KH is fairly low. This doesn't mean your PH will change for no reason, however if the right factors are in place your PH is liable to shift which IS extremely harmful to fish. However, if your KH is too high (like mine) your PH is extremely difficult to alter.
GH, or general hardness, is what determines the softness or hardness of your water. Most species of tank raised fish are fine with soft or hard water as long as they are acclimated properly. However, certain wild caught species can be extremely sensitive to water that is significantly different than their natural environment.