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I'm wondering how important it is to vacuum the gravel in a freshwater tank and how often. I've read different opinions, as well as differences in how to do it (i.e. do a 1/4 of the bottom per water change). If one is utilizing the gravel as a biological filter, doesn't the fish waste decompose...

I've now had two fish in a small tank (freshwater) for several months. My son got them at school, and I stuck them in an old small tank we had around, not thinking they would last very long, based on previous experience. But they have actually thrived! Anyway, the tank uses a gravel bio-filter...