Flukes or internal parasites?
I have a Sailfin Tang for about 6-7 years who periodically has fin problems. This comes and goes and can appear overnight and be cleared up on its own in about 3-5 days. Often, he does defecate stringy, clear, tube-like feces. The fin condition occurs about once a month then goes away, the stringy feces is constant. He is always a healthy eater. About once a week I feed frozen spirulina brine, marine frozen mix (either herbivore or carnivore -varying), daily feedings of spectrum marine pellets or Sera marine granules, and every other day 1/4 sheet of red/green dried algae. The other fish exhibit none of these symptoms.
Finally, I do have a 2'' in diameter sea carpet anemone and small bta. It is possible that he grazes the large anemone.
Any ideas?
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