I would agree with The Pilot. This would be a prime example of, "if it ain't broke, don't fix it!". Your tank appears to be swimming along (pun intended!) nicely. The use of Biopellets is simply another method (among many) for reducing nutrients such as Nitrate and Phosphate. It appears as though your current method (refugium+water changes+skimmering+low bio load) is working out just fine for you :-)
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