Another treatment that you may want to try as a last resort is Phenoxethol, an oily liquid available in stock solution. The solution is added to the aquarium at 40 ml per gallon. Carefully stir it into the water and repeat the treatment again a few days later. You can also use the solution to treat live food, which is a common cause of the disease, but fish will usually not eat food treated with Phenoxethol. Considering the options, however, this may be your best last-ditch effort.
Prevention Remove dead fish immediately from the aquarium.
Make sure that fish receive a healthy diet and only high-quality aquarium foods. Disinfect the aquarium after an outbreak because the fungus, if excreted by an infected fish, can live for months at the bottom of the aquarium. All rights reserved.