This guy passed this morning. Still baffled as to what's going and hoping to put a stop to it before it claims anyone else. Any ideas anyone?
columnaris if he died that quickly.
An infection will usually first manifest in fish by causing frayed and ragged fins. This is followed by the appearance of ulcerations on the skin, and subsequent epidermal loss, identifiable as white or cloudy, fungus-like patches – particularly on the gill filaments. Mucus often also accumulates on the gills, head and dorsal regions. Gills will change colour, either becoming light or dark brown, and may also manifest necrosis. Fish will breathe rapidly and laboriously as a sign of gill damage. Anorexia and lethargy are common, as are mortalities, especially in young fish.
Bacteria can be isolated from gills, skin and the kidneys. For definitive diagnosis, the pathogen should then be cultured on reduced nutrient agar. Inhibiting contaminant growth on the agar by adding antibiotics and keeping the temperature at 37 °C should improve culture results. Colonies are small, 3–4 mm in diameter, and grow within 24 hours. They are characteristically rhizoid in structure and pale yellow in colour.
Ulcerations develop within 24 to 48 hours. Fatality occurs between 48 and 72 hours if no treatment is pursued; however, at higher temperatures death may occur within hours. Other symptoms may accompany the disease, including lethargy, color loss, redness around the infection site, loss of appetite and twitching or rubbing the body against objects.
As Flavobacterium columnare is Gram-negative, fish can be treated with a combination of the antibiotics furan-2 and kanamycin administered together. A medicated fish bath (using methylene blue or potassium permanganate and salt), is generally a first step, as well lowering the aquarium temperature to 75 °F (24 °C) is a must, since columnaris is much more virulent at higher temperatures, especially 85-90 °F.
Medicated food containing oxytetracycline is also an effective treatment for internal infections, but resistance is emerging. Potassium permanganate, copper sulfate, and hydrogen peroxide can also be applied externally to adult fish and fry, but can be toxic at high concentrations. Vaccines can also be given in the face of an outbreak or to prevent disease occurrence.
The bacteria can persist in water for up to 32 days when the hardness is 50 ppm or more.
Primarily just dull, but they do get fairly pale toward the end. There is no visible fungus or anything of that sort.Are the patches you're describing just dull or is there anything else notable about them?
Columnaris was my first thought, but it just didn't look much like the columnaris that I remembered dealing with many years ago. I also had thought that it would have affected the fish that were in the tank during the August - November time frame if that was what it was since it is so highly contagious. Not disagreeing with the diagnosis, just explaining why I initially looked elsewhere for answers...Ah, What you introduced in August never went away. I would guess columnaris. You'd have to treat the fish and tear down the tank with bleach or it'll linger in there forever.
Qt is a hassle but this is much more of a hassle.