Supplements for Healthy Planted Aquariums: Seachem Flourish Excel
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Seachem Flourish™ Excel

Seachem Flourish™ Excel
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Frequently Asked Questions

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Q.  Is Flourish Excel a replacement for CO2 in a planted aquarium?
A.  Yes and no. It provides the same benefit as CO2, i.e. it provides the plants with a source of carbon for growth just as CO2 provides them with carbon. However CO2 by itself will give you quantitatively more growth than Excel by itself, although Excel does provide a substantial amount in comparison. If CO2 is a 10, Excel is a 6-7. Using both together provides additional benefit. One of the advantages of the Excel is no up front equipment costs and complexity of valves, hoses and regulators, etc.


Q.  Is it better to add Flourish Excel at night or in the morning based upon plant carbon uptake physiology?
A.  Carbon intake is a function of photosynthesis. Based on this, it would be ideal to dose Flourish Excel during the day. But given that Flourish Excel can stay complexed as a carbon source for up to 24 hours before it dissipates, you can dose at any time of the day and the product will be available for the next 24 hours. Flourish Excel is not carbon dioxide and there is no impact on pH using Flourish Excel.


Q.  Will an airstone or surface agitation decrease the effectiveness of Excel as it would decrease the effectiveness of CO2 injection? What effect would it have on Excel?
A.  An airstone or other surface agitation will not impact the effectiveness of Flourish Excel. Flourish Excel is not CO2, it is simply a readily available source of carbon. This is an intermediate source and more readily available than CO2 and will not interfere with the uptake of CO2 as a carbon source.


Q.  Is Flourish Excel safe for fish?
A.  Yes, when used as directed, Flourish Excel is completely safe for fish.


Q.  I've been using Flourish Excel for four days, and I've noticed that my Anacharis seems to be dying, while my other plants are doing fine. Why is this?
A.  Anacharis is a particularly sensitive species (known to be sensitive to high temperature, trace copper, formaldehyde etc.). It is also sensitive to Flourish Excel. If you have Anacharis in an aquarium in which you are dosing Flourish Excel we recommend using Flourish Excel every other day rather than daily.


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