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Originally Posted by Seriak
A pH meter would be handy.
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Actually, an alk test would be better. The introduction of an acid to the tank will lower alk before affecting pH. If the pH drops, you already added too much. That said, I have added large quantities of vinegar (and hydrochloric acid) to my tank without any trouble. As was pointed out, if you're killing a few, the vinegar shouldn't be a problem.