Lymphocystis
Lymphocystis is the most common viral disease observed among saltwater fish, though advanced freshwater fish (perciform fish, such as cichlids and gouramis) may suffer from lymphocystis, as well. It is not particularly infectious, but instead seems to develop in response to poor environmental conditions. Among wild fish, heavy metals, poisons and consistently poor aquarium water quality have all been identified as possible triggering factors oflymphocystis.
Lymphocystis causes the body or fins of the fish to develop wartlike growths. These growths often have a characteristic light brown coloration and a rough, cauliflowerlike texture. The disease is not life-threatening, unless the growths obstruct a major body opening of the fish, such as the anus.
Provided aquarium conditions improve, Lymphocystis infections usually go away by themselves, though this may take several months.
