What's wrong with the S-shaped body of a fish?

The ornamental fish raised in my family has been around for six months. Recently, two fish have been found to be deformed and smaller than other fish. What is the reason and can it be cured?-- it seems to be a parasite. Expect the master to answer accurately-you'd better send a picture! In addition, the lack of vitamins will cause fish deformation! -- what kind of fish do you raise? did you not pay attention to this problem when you bought a fry? what's so strange about two fish? you can sometimes eat a few grains of sand when you eat. But I only have three fish in total, and the morbid ones account for nearly 70%. Isn't it scary-- or it could be a lack of calcium and phosphorus-- first check what you're feeding. Then see if some kind of heavy metal in your water exceeds the standard. Oh, it's hard to say. Or the water company will kill me. See if you take any medicine, such as: hehe, stop talking. Reflect on this question. If everything is all right, I suggest you go to the person who sells your fish for two. Zjying added the following sentence at 11:19 on 2009-11-10, hehe. You can't say this quietly.-- lack of nutrition, change to a fresh point, short time, comprehensive nutritional value of the feed. You said that the fish is S-sex, which should be curved body disease. There are two reasons: one is that the water contains heavy metal salts, which stimulate the nerves and muscles of fish. The other is the deformity caused by the lack of calcium and vitamin C. The data method is to change water frequently and feed nutritious feed-agree with upstairs that it is generally mineral deficiency, vitamin deficiency, or heavy metal. There is also whether the feed is stored for too long. Lack of nutrition, change the fresh point, I also like it.