Instant Ocean causing KH spike??

[alfredshouse]

Ive had a major tank crash and Im trying to diagnose what went wrong. Its been almost 12 hours now and Im looking at every possibility. I discovered my KH is off the chart. Even after a 1/3 water change and then a 50% water change both today. My KH is still off the chart. Makes me think the Instant Ocean is the culprit. Sure enough I test it and it is the problem. I know sounds stupid, I tested it again and again and I used my neighbours test kit and it reads the same thing. 140mg/l. Safe range is under 125mg/l.
Im pooped, but should I do another water change? What would be the point in that, if its the salt? If I get up in the morning and my corals are dead, "somebodies gonna get hurt real bad. Im not saying who, but I think you might know him." Sorry, I think the Robaxacet is kickin in.