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Flourish Excel provides bioavailable carbon to your tank. It is great for planted aquariums, but will also support bacterial growth to support nitrate reduction.
Recommended initial dosage or for every water change over 40% is one capful (5 ml) for every 40 L (10 gal). Thereafter, 1 capful for every 200 L (50 gal). The 250 ml (8.5 fl oz) bottle will treat about 9,800 L (2,450 gal).
Do Not Overdose!