have 12 carp of which this is one of the smaller ones - for the past month or so v lethargic, pink underbelly and distended gut. pond is 3m x 4m approx. 5000 litres. fish is very sick have left it to kill or cure?
After this long a 50%water change may help. use water at approximately the same temperature as the tank (test by dipping your hand in) and make sure to dechlorinate it before it goes in. I would imagine nitrite is falling, just still above the range of the test kit. I would expect to see it come down pretty soon now.
Quick update and seeking advice. So I still have off the scale nitrites after them appearing almost 3 weeks ago now. I measured the kH which is at 3 degrees at the moment. The nitrates are also off the scale at the moment. I also measured the pH as I hadn't done that in a while. It is sitting at 8.4 but I suppose this is to be expected with these extremes of nitrogen based compounds in the tank? Is there something I could be doing to help speed this up?
Re: Advice for stocking fish and plants in an inherited pond
So after getting the waders on, and getting in the pond, it has been decided to drain the pond to clean it out. As I stood in the pond the sludge and leaves came up to my knees, which is what led me to the decision. Blimey it doesn’t half stink!!
Tried to upload pictures but the file size is to big, going to have to get in the laptop