It's hard coming home to a tank in bad shape. I know how you feel. Try to bring your alkalinity to 12 for the day. I would not leave it above 12 for any longer than 24 hours. I think the acid is kind of overdoing it but is a useable option. One way to bring Alk down is by adding Calcium. This can be done with additive. Just don't use Kalk as it will raise the Alk more. Try to get more oxygen in your house to bring CO2 down in the tank therefore bring Alkalinity down. Hopefully you have a small tank so water changes will be easy. After you get it to 12 lower it by one a day until you get back to where you want to be.
Johnny
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