12-06-2006, 12:42 AM
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Sounds like your fish are stressed out, and your conditions are pointing me in one direction...poor water quality.
Do you have a liquid test kit? If not, get one and test your water immediately, and post the results for ammonia, nitrite, and nitrate. How big is the tank? How many fish and what kinds are in the tank? What is the pH and temperature? How long has the tank been set up? More information is needed on your tank.
Columnaris, or mouth fungus, is what the guppy had. The fish should have been promtpy removed, because this disease is highly contageous. As for the comet, are you talking about the species of Goldfish? That itself could lead to problems. Sounds like it had fin rot, and/or symptoms from other diseases like columnaris. Sounds like an extreme case when you say the fins have disappeared, so that means the may beyond the point of repair.