I like to use carbon and purigen. Not 100% sure how purigen works but before I started using it my ammonia/nitrate levels fluctuated daily and since I added purigen it's been at 0 for a long time now. I was gonna test it again by removing my baggy for a week and see if there were changes. On a side note I do a daily 2Gallon water change and a 5Gallon water change on weekends for my 40 Reef so I'm not sure if that plays a factor with fluctuation. Tanks starting to look real good now though so I'm happy with my regime.
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