Hi, had koi for 25 years, this year took my eye off the ball, fish on bottom that are not recovering, one still on bottom, 1 suspended nose pointed to bottom of pond, aeration at 2 ft 6 inches pond is 6ft. Don't want to give up on them, can anyone advise?
Sorry to read about this and even sorrier that no-one's been able to provide any advice before now.
How is the situation now?
I have next-to-no experience/knowledge of ponds other than passing on some advice and useful weblinks to a relative who's currently helping out with a pond. However, on the basis of that very limited experience plus much more aquarium experience of goldfish, I wonder if feeding of vegetable matter (eg peas, courgette) might help to address what might be a buoyancy issue and perhaps flush through any undigested other food in their innards?
Let us know how the fish are now doing and perhaps one of us can advise further.