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Gingerbread Tropical Fish & Coral (Lifetime Rating is 2255 with 98% Positive) has the 1 gallon size of Fritz Aquatics Fritz Zyme 7 live Nitrifying Bacteria for only $ 9.99 with fulfillment by Amazon so it’s PRIME eligible.
Fritz Aquatics FritzZyme 7 Nitrifying Bacteria for Fresh Water Aquariums https://www.amazon.com/dp/B0002DG…WB4GT