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Similar to Calcium, Alkalinity (Kh) gets consumed daily by corals. If we do not replace this consumption our levels will drop and cause damage to our corals. We should maintain Kh at 8-10. Test often with a quality test kit. In our opinion this is the most important number to test and manage appropriately. Its also important to maintain Kh as stable (without big fluctuation) as possible.
Quick guide: If we want to increase Kh by 10 dkh or from 8.00 to 8.10 in a 100 gallons of aquarium water, we should add 20 ml or .7 fl oz. Add slowly and test as needed.