Me and a couple buddies recently started renting a house from people and we have about a 500 gallon fish pond. This pond was left alone for about 2 months and all of the fish survived. We were cleaning the filter out every day and the pond finally got clear again after a month or so. There were 5 goldfish that were about 5 inches each and about 20 smaller goldfish that were about an inch in length. All of these fish died suddenly a couple days ago and i don't know why. We started noticing white bubbles and foam on the surface of the pond were the filter sprays water back into the pond a couple days before they all died. The ph was around 7.0 when i checked last and everything else appeared ok. I don't know if rain could have affected the water either (we live in Atlanta so rain water is not the cleanest). Any help would be appreciated! Thank you!
Jeff
Jeff