I recently discovered a yellow lab in my tank with a beat up looking white nose. I have had similar issues with this one and his mouth but he got better and is still eating and active. I think it is more digging, or lip locking with another as there are 2 or 3 with same nose and rest of tankmates are fine. I recently moved few out of the tank and this began the struggle for king of the tank lol and *** seen them all puffed up and war paint showing so to speak. In the pics it looks fuzzy but its not really fuzzy fuzzy. the tank parameters are 0, 0, .10 or so and the temp is 81 or so. I do 30% water changes every 5 days or so and was wondering if i should just keep water clear or should i add something to help healing or stop secondary infection. I was concerned as I have posted about this particular yellow lab a few months ago also but it was his mouth not the top of nose and either its from scrapping with another or 3 of them have a health prob.