I had 7 goldfish and I have a 50 gallon tank (they are small goldfish) and I have had them for about 2 years. I even moved across the country with them this past summer and they all survived. I looked at the tank today and noticed that it was very foggy and then I saw 3 of my goldfish floating at the top of the tank dead. I went into the office (where I have the tank) and the smell was horrendous. Their tails are split like they have ich but there are no signs of ich on them. 3 of them are still alive but they are in bad shape (split tails, etc.) What happened??? I am very saddened to have lost them. I grew attached to them.