We have had 2 bad fish kills in the last 9 years. The first time the fish came bad strong but the last one has left a ton of bullheads and stunted croppie. When the pond fills up it floods tall weeds that decomposes. The pond is also down in a deep hole and does not get as much wind action as most ponds. I would like to be able to keep the fish alive without spending several thousand dollars. thanks