Sorry to hear that aquitori, don't be embarrassed, it happens to all of us. I left a gallon of muriatic acid used to clean the cement by it on a ledge last year and the cap loose. Some kids came over, got to wrestling right there and guess what? An hour later every koi in that pond was dead. Lesson- no muriatic acid near the ponds again, and no kids allowed to rough-house right by them anymore. Just think, now you can get even better koi!
