That looks like a tumor, but I will wait to see water test results before I go into any details. I will be taking this pic to cross reference with some medical text books I own, and consulting my husband who is an aquatic biologist and who's specialty is in health issues.
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Tropical Fish Keeping
forum community dedicated to tropical fish owners and enthusiasts. Come join the discussion about species,breeding, health, behavior, aquariums, adopting, care, classifieds, and more! Open to fish, plants and reptiles living in freshwater or saltwater environments.