Pearl Danio

[xxdiamonddebxx]

My pearl Danio's nose has turned dark blue (almost black) it has done this before and it went away but now its came back darker and it wont go away it looks as though its almost like a scab this time. Does anyone know what could cause this and if there is anything i can do about it? i have checked my water levels and there all fine and my other fish are fine. Anyone???

 

[The-Wolf]

He may have a tumor or something.
Does the bump look like it is under the scales or is it on top of them?
If it looks like it is under the scales and pushing them out it is probably a tumor. There isn't much you can do except keep his tank clean so his immune system is stronger and he is as comfortable as possible.

If it is a sore that is on top of the scales or the scales are missing I would say it is infection. Keep the water clean and use Melafix.
Change 25% of the water every couple of days while he heals.

Good luck