I use this material all the time and it is a MUST HAVE for small aquariums. I buy several bottles at a time as the bettas need a 25% water change weekly and I buy a bottle about every 2 months. The instructions are simple, and I love the fact that it tells you how many drops go with how much water (usually something smaller, like number of cups). Similar items tell you how many teaspoons or whatever per gallon or 10 gallons, so it's up to you to figure out how to convert them into smaller aquariums. I also recommend the same API brand and their AlgaeFix for every water change: Aquarium Pharmaceuticals® Algaefix (1.25 oz). .)
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