Where do you want to keep your ph, gh, and kh at in a fresh water tank? I also have a water softener, is that a good thing or a bad thing?
Ph, gh, and kh question: depends on the type of fish.
Water softener question: depends on the method used to soften the water, I believe that some water softeners add salt to the water, which will actually raise either your gh or your kh (not sure which). Anyone want to verify?