Randy Holmes-Farley
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While it may simplify water changes for the alk to match the tank goal, there's no reason it needs to. Small water changes have little impact on alk, even when it doesn't match.
For example, if you are at 8 dKH and do a 10% change with 12 dKH water, the alk only rises to 8.4 dKH, which is less than the daily demand in most tanks.
For example, if you are at 8 dKH and do a 10% change with 12 dKH water, the alk only rises to 8.4 dKH, which is less than the daily demand in most tanks.