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I'm of the opinion that your water change schedule should relate to the rate of Nitrate buildup in your tank since one main goal of water changes is to remove Nitrates that are the end product of the Nitrogen cycle that breaks down wastes in your tank. It is advisable to do water changes when the Nitrate level is between 20ppm and 40 ppm, and to not let it ever get above 40ppm. If you use a test kit to measure Nitrates for a while, and also before and after a water change, you can get a feeling for not only how fast the Nitrates are building up, but how large a water change is necessary to bring them down below 20ppm. Once you get a handle on that, you can figure out how often and how large a water change is appropriate for your particular setup.
 
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