My dosing pump stayed on and dosed enough alk to change my alk level from 7.5 to 12! I came home to a cloudy mess. I estimate in about 15 hours it changed this much. I've done a 20 gallon water change on it, i'm just waiting on water from the ro for more. ph is around 8.2 after adding about a 1/2 cup of vinegar. What else can I do and will a jump like this kill considering its still within parameters? Zoas and hammers are still open, I cannot see anything else.