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Tropical Fish Word of the Day: Alkalinity

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Alkalinity: (n.) Alkalinity, which is expressed as dKH (German degrees of hardness), meq/L (milliequivalents per liter) or ppm CaCO3, is the estimate of the carbonates in the aquarium. This measurement is important for reefkeepers because carbonates are important for coral skeleton growth, and the measurement of alkalinity also determines the ability of tank water to resist pH fluctuations. Alkalinity in freshwater aquariums is also important, as freshwater fish need softer or harder water depending on where they come from in the wild.

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