I have a white tipped shark and he is about 2 1/2 - 3 yrs old. He started forming this sore on the tip of his nose a couple weeks ago. He was banging around the 20 gal high tank we have him in after his goldfish friend of 2 1/2 yrs died. I figured the sore was from him banging around but then he started getting worse. He just lays there. Hardly swims at all. A couple times we thought he was dead and when going to get the net and putting it by him he would spaz out again banging into the tank and then trying to jump out of it. About four days ago he developed this sore on his back and it is getting worse. Looks like some flesh eating disease. None of the other fish are having his problems (we have a glass fish in the tank of 7 yrs, a sucker fish, a neon fish, and 2 other small fish... which are all perfectly fine).
Here are a few pics of what he looks like right now.
Here are a few pics of what he looks like right now.