09-03-2008, 08:18 PM
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Granite should have no ill effects on the aquarium itself, granted you rinse it well first. However, if it's got sharp edges I wouldn't suggest using it with any fish that burrow or sift through the sand, as it could injure them.
What sort of cichlids are you interested in? Cichlids are a diverse group of fish so substrate requirements could vary greatly.