If the vinegar you already added doesn't do the job, go for the seltzer water, just get a bottle of soda water and start adding it. Your ph will come down pretty quickly. To head off any near-future disasters, you might want to mix up a whole lot of new water and get ready for a large water change, maybe some carbon too. I don't know too much about leathers, but if I'm not mistaken they can release some chemicals when stressed that your stony corals won't appreciate. Good luck!
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