When I worked for a tropical fish wholesaler, way back when, we had a variety of chemicals and products available to us, mainly designed to handle icnoming shipments and to a lesser extent as cures to problems. At the wholsesale level, most of what we dealt with was bacterial infections and secondarily parasitic. Bacterial remedies centered around Penicllin and its derivatives, dyes, and Tetracycline. I found that TC was not only the messiest in terms of water, but the best in solving bacterial issues. Your reasonably convinced that you have a parasitic issue. We used Formaldehyde (Formalin)and or dyes. Clout was a product we often used. We also used chemicals in combination, like Salt, Sulfa, Furazone Green, and Formaldehyde. That covered both bacterial and parasitic.

Well I put him down. The protrusion reduced, then flared dramatically! Almost tube like and caluflower like together. I went back to the pet store and only one was left (others died) and it had a roundish growth coming out of its mouth, so that it's mouth was full and could not close, looked horrific. (I put him down, someone knows me there and lets me do that). My guy was staring me in the eye, the moonlights are pretty friendly unlike the other shy dwarfs, so it was pretty hard to do. I gave him a meal of brine shrimps then low light in bathroom. Let him calm down and with latex gloves (in case tb) took him out and whacked with flat rock. (in between papers) I hate doing this but tried the clove oil and they get frantic and too long mho. I tried what my vet suggested, alkazeler (again too long and they get frantic)... I counted, took 3 seconds. Sigh and boo hoo. Sherry

I searched on the web and found a new and much better source in China town. Not a chain, they survey their sources and have sterilized water in tanks. So will try one from healthier source (for all my fish actually).