Tai, Do you know exactly how many gallons your pond is, I mean exactly? Do you have one kind of fish or multiple kinds, Do you have anything in the pond that has metal? Have you used ANY medications since the last 100 percent water change? It only takes missing one part of the formula to make this kind of mistake. I used a medication I have used in the past with no problem, one thing changed, I used it when there were only koi in the pond, This round I HAD a channel catfish. Didn't even think about the medication reacting to it. Found it dead and all the Koi gasping. If I had not walked out early in the morning and found the dead catfish I may have not noticed that the Koi were under stress. Public aquariums have strict guidelines, but even the most experienced staff will and are going to miss something from time to time. I know it seems like someone made a VERY bad call, but in reality, it could be that what is learned from that mistake will lead to helping hobbyist like you and me from making that same mistake. At least they have the money and resources to find out what happened, why, and what can be done to prevent it in the future. It's a new medication they were trying, Can you imagine what it would be like to go and try every medication to see how it reacts in your personal pond until you found out what worked and how many fish it killed until you found the right concentration that it worked with out killing. So keep in mind, what seems to be in your eyes someone sleeping on the job, may actually be the someone that is preventing us from making the same mistake in our ponds. Always two sides to every story. Especially in keeping fish!
