The potential of hydrogen in any compound is known as pH. In the case of the water that sustains aquarium ecosystems, pH measurements indicate the levels of acidity or alkalinity, which fish keepers should strive to keep balanced according to the aquatic species they care for. The pH scale goes from 0 to 14. The lower numbers veer toward acid levels while the higher numbers denote alkaline levels. The ionization of water molecules affects the pH. In essence, the higher number of hydroxide ions results in alkaline water while the higher number of hydrogen ions causes more acidic water. Carbon dioxide has an effect on the pH levels of aquariums, …

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