Guys I would like your thoughts on feeding catfish food to koi. I understand a lot of breeder feed catfish food to their koi. I have seen some drawbacks to feeding catfish food to goldfish but not sure if it will do the same to koi. Noted the goldfish developed dropsy when feed catfish food over extended period of time. Also, why is corn bad for the koi? Can anyone tell me if the make up of the green carp is any different in terms of what they can eat. Reason I am asking is my boyfriends mother have green grass carp in the big ponds and they eat the catfish food all the time and I have not noted a problem with them, they are growing well and not over fat, good lone stream line body's. I need to add that most of the time they are feed about three times a week.