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Flourish Comprehensive provides micro/trace nutrients and not macro nutrients. There may be a little bit of Nitrate, etc in it, but not enough to qualify it as a macro nutrient. The Macros in the Flourish line are Flourish Nitrogen, Flourish Phosphorus, and Flourish Potassium. Dry Ferts are much more economical, but the Flourish line will do in a pinch. Just make sure to dose using the formula for targeted levels, instead of the recommended beginning dose.
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