I used Kent's 2-part "Tech CB" with good results. I don't think there's one "best" additive, though. I think many will work just as well as the other, as long as you're able to figure out how much/often/etc. to meet the needs of your tank.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz

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