My girl, Bella, a 2 1/2 year old female betta, has what I originally thought was a tumor. Maybe that's what it started as, but now it's an ugly ulcer. I am treating her in a separate 5 gallon, with clean water, salt, and melfix and pimafix, both at very small doses. I have also offered her antibiotic pellets soaked in garlic guard but she hasn't eaten any. The wound is on the top of her nose, and it started out as a bump. Last night it opened and was red, with white on top, and from closer inspection, starting to fungus. Today, I can't see the fungus, but its still white, and not so nice looking. I thought I'd start this thread to go through the treatment of an ulcer/tumor, in the hopes that it could aslo help someone else. Of course, other suggestions are welcome. I know Bella's not a young girl, but she is otherwise in very good health (she appears so), so I have confidence that she can beat this. I may decide to change her treatment if this does not do the trick, but for now, I'll wait and see. I tried to take some pics, but sorry, they are not great.