I noticed my biggest RBS has a growth under his neck. I saw it about 3 days ago when I noticed he was breathing hard and staying by himself. He usually sits in front of tank waiting to eat. The growth is off center and is a little more on his right side. The growth is keeping his gills spread apart and making him breath hard. I say growth but to me it looks more like it is inflamed. There are no breaks in the skin though. I am treating with Binox (nitrofurazone) right now because it look bacterial to me. Has anyone seen anything like this before?