what about nitrates and nitrites? I just got this from the pinned topics is it like this: Skin ulcers
Signs: Ulcers usually show up as raw opened areas on the skin. They often have reddened edges and may be associated with other symptoms of systemic infection or disease.
Cause: Aeromonas, Pseudomonas, Mycobacterium and Vibrio
Transmission: The bacteria are commonly found in the water and will invade a wound or skin injury on an otherwise healthy fish.
Predisposing factors: Previously damaged skin, poor water conditions, and stress can all lead to an increase in ulcers.
Treatment: Antibiotic baths coupled with anti-fungal baths containing phenoxyethanol are the most common treatments. Improving water quality, reducing stress, and decreasing the risk of injury are all very important in reducing the incidence of ulcers.