For example, fish in the seawater tank are also exposed to viral infections, lymphocystis and bacterial infections. While the virus infections have not yet been extensively researched, lymphocystis infects the skin and fin tissues (white dots preferably in butterfly fish, angel fish). Dark brown to rust-red discolorations are always an indication of local bacterial infections and are often treated with a broad spectrum antibiotic.
In the event of anomalies of this or a similar type, there is definitely a need for action and you should contact a marine biologist you trust in order to discuss the exact treatment strategy and medication.
Overall, the range of appearances and causes is far greater than the possibilities mentioned (see also velvet disease, worm infestation, parasites, fungi, etc.). It is therefore always important to consult us and to pay close attention to the administration, use and dosage of the various products from Aquarium Münster, Korallenzucht, Microbe-Lift, Preis, Prodibio, Söll or Tropic Marin.