Hello, I joined this website because I'm really concerned about my crowntail, Otis. At the end of winter break, I noticed that his top fin had turned to white (from his original dark blue). This had happened over night so I immediately noticed. I first thought that he may have grabbed it (he is a tail biter) and thought nothing of it, thinking that it would heal within a few days. But it's been about a week and a half now and now part of his body is white. I then thought he might be changing colors, but I'm really not sure and would like some input. Any help is gladly appreciated!
Otis lives in a filtered and heated 2.5 gallon tank. It's kept at 80 degrees. It's a fairly new tank, but he's lived in it for about a month. He still acts his normal, feisty self and is eating normally!
The first picture is from a few days ago, and the second one is from today.