I'm not a big fun of Hanna after their Calcium checker get released but Alkalinity one was(is) pretty good. I would double check the type of reagent and expiration date. For me checker was always close to my other test kits and consistent enough so I can relay on it. Don't do anything special to bring your alk down. I would try third test kit to be sure about it level and if it's indeed high just stop dosing it. You can still do your regular WC. Bringing alk DOWN quick is really bad for SPS.
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