I think it is "Lymphocystis" aka cauliflower disease. This is from the University of Florida "Lymphocystis is a chronic disease of freshwater and marine fishes caused by infection with an iridovirus known as Lymphocystivirus or Lymphocystis disease virus (LCDV), which is a member of the family Iridoviridae. Infection results in the development of pebble or wart-like nodules most commonly seen on the fins, skin, or gills, although other tissues may be affected."
For treatment:
"Currently, there is no good treatment that will speed up recovery from this disease. Most often, the disease must run its course in an affected fish. Fortunately most cases of lymphocystis in warmwater fish will resolve on their own after a few weeks, as long as husbandry is good (good water quality/chemistry, good nutrition, correct population densities, optimal social groups) and as long as other stressors have been eliminated. Although it is not an ideal solution, at present, the best option is to hold fish for several weeks (longer for cool and cold water fish) until the lesions have cleared.
Any thoughts? I think it must be it. Closest I have found.
