Yes, sorry for the confusion. The first thing I did was run to my coral store, buy 20 gallons of water, and changed it all. At that point I didn't know what happened so thought it was my salt water mix, which it was, but I didn't know why. I wasn't sure if that fix was enough, but hopefully it was. Still, new water's PH is only 7 but then maybe the test strips don't work. I need to order a new PH checker. Thanks for your help.you just did a 100% water change so that is the value of the new water.
I ment when you added the acid, because that should have lowered the alkalinity.