feeder goldfish can live as long as any other goldfish and they can get alot bigger than 4"sjohno27 said:The key word in your discretion is Feeder they are meant to live 3 to 5 minutes after you get them home four years was a good run it may be that their time is just up. If guppy sees this he may be able to help you identify the disease by the symptoms listed above but i have no clue sorry.
Good luck and happy fish keeping
as for whats going on with them.... i have no idea... sounds like MoJo knows though
good luck