We have a well established pond in our backyard for approximately 3 - 4 years now. We have many goldfish and were doing well until this summer. In the past 2 weeks our largest 6 goldfish died. I checked the PH and Ammonia, which turned out fine. We have a waterfall, a small fountain and an aeration stone that I bought recently thinking it had to due with poor oxygen levels. These fish have multiplied every year and we have many smaller ones in the pond that seem to be doing well. Like I said before, it's the largest of the goldfish that are dying on me. Besides bloating (bloating due to death -right?) I couldn't see anything visibly wrong with their skin (i.e. ick, fungus). I also noticed our plants, which usually do very, very well aren't doing that great this year. I don't know what to do at this point. Can the pond be overcrowded? We did a partial water change recently and have been keeping a close eye on it. I just don't know why the larger fish are dying at this point. Please help.

I greatly appreciate it!

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