Hello! I made a post about this about a month ago but have since acquired several new pictures from throughout the internet and am reposting a mega thread regarding this mysterious presentation.
I have had a fan tail goldfish presenting with slightly raised white spots on his tail fin for approximately 6 months. They seem to vary in severity depending on the day but they are always there. He behaves and eats normally. Water parameters of the 55g aquarium are stable, usually around 20-30ppm nitrate with a 50% water change weekly. Temperature is room at about 70 give or take a few degrees depending on the day. They do not seem to spread to other fish. I have done extensive research on these spots and what is fascinating is the quantity of other folks dealing with this same problem, but the complete lack of answers/understanding of what is going on. Most seem to have the same story, bumps that last for several months on otherwise healthy fish. It seems the general consensus I’ve found is they are normal and not harmful. I’ve heard some people say they are brought on by higher nitrate weeks. From a purely superficial standpoint I would like to remedy this issue. Here is a pretty comprehensive collection of my own and others photos on the internet of these spots. If anyone has any experience with this PLEASE respond! There seems to be a real lack of education on what these are.