I will put in an endorsement for Medi-gold. It works like a charm. I keep a stock on hand at all times. It can be fed up to 14 days and has saved more than one of my fish. Evidently, it is quite tasty. Even the sickest of my goldfish has eaten it when it is hand fed and soaked in water. I would recommend keeping a stock for all goldfish keepers ( and no, I am not even getting a free bag of Medi Gold from this )