What can I say but it is happeneing. It was a couple of days ago and I was just topping up the fish pond out side and I put the tap in and went inside to deal with the new 90 gallon aquarium, then my son showed up and dinner was ready and i forgot all about the pond and the water ran all night. Wife discovered the next morning that all but 6 of our 10 yr old gold fish were all dead. Figured that there must have been 50 fish and 2 koi all 6-7 inches . The clorine in the water did it and now I am taking the pond apart to clean it right out. All other projects are on hold for the time being. God i couldn't have felt more rotten for it as we saved all the fish 4 yrs ago from another neglected pond.