I have two koi there about three years old that have swim bladder I read that I need to feed them peas but they won't eat them what do I do? How can I get them to eat them? I live in Montana so I take them out in the winter and put them in an 80 gallon tank in my garage they've done fine in the past. But for some reason this year two of them have swim bladder. Any help would be appreciated.