Why do my aquarium rocks keep losing their color ?

Question by KARMA: Why do my aquarium rocks keep losing their color ? Every time I clean my aquarium rocks they lose their color. Is that dangerous to my fish (goldfish). Best answer:

Answer by Marc
Well, first off, you shouldn't take out and scrub your rocks if thats what your doing, your killing the ecosystem. It isn't that dangerous to your fish, but you realy shouldn't take them out and scrub, you should use a gravel vaccum to clean them. Typically rocks don't loose color unless they are older or cheap, and the only way it will
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