We have inherited a pond with the purchase of our new home some six months ago. All has been great until quite recently. One of our fish had dropsy so we have removed that one but ALL the others are now very sluggish. They are not quite on the bottom of the pond but just sort of hang around pretty low down in the water. They used to get very animated when anyone stood over the pond but not anymore. Having said that they still go crackers at feed time. Any words of wisdom for u?