One of my employees needed to make some extra money. Today his day off he went to my house to do some yard work. He was suppose to do some yard clean up, I was at work. I have a 300 gallon pond with 5 goldfish, I could not believe they all made it thought a harsh winter. Early spring water had turned green, I was waiting for it to clear by its self. When I got home today water was clear and 1 fish was swimming on its side, others where glupping air at surface. I could not believe he changed water without asking. I have city treated water. I had a large bottle of prime next to pond. I called him and asked if he added anything to the new water nope. I poured the whole bottle of prime in pond. I guess it is a waiting game now. I thought pond froze solid this winter and all fish died, so I kind of see these as my miracle fish. I can not blame him he thought he was doing a good thing cleaning the pond feels bad.