09-14-2011, 07:19 PM
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Flourish Comprehensive [they make several products under the Flourish name] is a complete comprehensive fertilizer. It has all required nutrients except oxygen, hydrogen and carbon. Of course, the macro nutrients are in limited quantity, since most will be otherwise available in the aquarium. But it is complete in itself and can serve as the sole fertilizer in a natural planted tank.
Having said that, the addition of substrate tab ferts (or an enriched substrate) will benefit substrate-rooted plants, especially those that are heavy feeders such as swords and Aponogeton. I have maintained tanks of swords with just Flourish, and with an enriched substrate plus Flourish (the latter was still necessary) and with Flourish + Nutrafin Plant-Gro sticks or Flourish tabs.
The nitrite rise is intriguing. I have a hunch, but I'll keep it to myself for the present.
Last edited by Byron; 09-14-2011 at 07:22 PM..