Amazon.com : SunGrow Betta pH Test Strips for
FOR READING pH OF FISH TANK — Test your aquarium water to make sure it isn't too alkaline for your fish. Tropical fish like Tetra, Betta, Barb, Catfish, Bichir and Corydoras like pH in the range of 6.5 to 7. A tank with higher pH may cause freshwater fish to be irritable or even make her ill. Ensure your tank’s pH is correct with the test strips.
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