I have not added any new fish in over a month. All the sudden the tangs look like they have latteral line disesase. It is a bunch of red dots as small as a pin point around the face. The two triggers, pink-tail, and Hawaiian lei. Trigger both have spots of fungus on the back fins. How would i treat this, and how did it come about like this?

Like fin rot, fungus usually occurs when aquarium fish have been damaged or stressed by poor environmental conditions.
Fungus spores are opportunistic and given the chance will invade most types of organic material, including living tissue. Fungus do not harm healthy aquarium fish because the mucus layer on the skin of a fish prevents the spores from infecting its living tissues.

However, if the fish’s mucus layer is damaged, fungus can quickly develop, particularly if the fish is living in dirty or otherwise unhealthy conditions. Rough handling is a common cause of fungus, but other common causes include fin nipping and fighting among fish. Any diseases that produce open wounds, such as ich, ulcers andd holi-in-head disease, can lead to fungus.

Fungus is also associated with environmental stress, presumably because fish exhibit a weaker immune response when they are not properly taken care of. Chilling, poor water quality and inappropriate water chemistry are all common reasons why aquarium fish develop fungus. Keeping brackish water fish in freshwater conditions can also lead to fungal infections.

So the big question is, what are your water parameters reading?
Ammonia, Nitrite, Nitrate? Calcium, Salinity?

Bacteria & Fungus Medications: Aquarium Pharmaceuticals Pro Series Fungus Cure
Ich and External Parasite Treatments: General Cure

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