07-15-2011, 01:26 PM
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Agree. If nutrient fertilization is required, you start with Flourish Comprehensive Supplement once a week at the dose indicated on the label. Flourish Comprehensive contains all but 3 nutrients that aquatic plants require, the three not included being hydrogen, carbon and oxygen since all of these will naturally occur in any aquarium. And the nutrients in FC are balanced proportionally.
Excel is a liquid carbon supplement that I do not recommend. First, it has chemicals that can cause problems in large amounts, and I am an aquarist who believes chemicals have no place in a tank with fish unless absolutely necessary (as dechlorinator for instance). Second, this product can affect some plants, notably Vallisneria, and they melt. Third, it has to be dosed daily to have any practical value, and that sets up a different and higher level of balance biologically. It is preferable in my view to let nature handle things more with less "meddling" from us.