Only lasted 2 weeks, had purchased two paradise fish from animates which were in with the goldfish and were brought up in an unheated tank. put them in my tank (90L) with 4 other goldfish and all was well until the last few days!! Both of the fish had developed a white fine furry growth over all over there bodies. The fish were floating upside down and really uncoordinated and a day or so later have both died. I have tried to research into diseases but could not find what it could be. The other goldfish in the tank seem fine. I change 25% of the water weekly and am running two large carbon/wool filters. Any help would be much appreciated as i want to get more of these fish as they are a good contrast to the goldfish