I am testing with an API liquid test kit. These Zebro Danios were bought from a local pet store called Uncle Bills. Parameters are ammonia 0, nitrite 0, nitrate <5. I tried treating the tank for Ich because that was my guess. What is happening is this fish looks like it has been attacked but nothing has bothered it. It looks like parts of the outside of the skin on the back have fallen off. It's body looks red in areas. If you look in the mouth, it looks redder than normal. I really don't notice white spots but the body kind of looks like the scale has been damaged. I can stop the ich if you think that is meaningless, but it needs some sort of help or it will be dead soon. The other fish in the tank are fine.