I would be very curious to know what in the world that is on him. Is it growing bigger? It really makes you wonder how in the world he even got that. I wish you the best of luck. It sure is scary! Keep me informed. Do you have a nice sharp scalpal? If not, I'd use a brand new alcohol soaked razor blade. Clean his nose real good with a soft brush and betadine. Then poor the Betadine on his nose right before you make the cut, then immediately poor more on it right away. I might even put a dab of Neosporin Ointment on the wound, unless you have a specific antibiotic ointment for fish. My instinct would be to put on the ointment so no bacteria can get into the open wound. A vasoline base medication will help wick away the water until some healing time can set in. Poor guy! Good luck Girl. You know I'm always here rooting for you! ......Angel