These guys have had it for quite some time now (months) and still appear to be otherwise healthy. How long does it take for the Columbian's to die? I checked the fish pharmacy site which said pretty much the same thing, a growth or a parasite infestation, but other than that I can't find any information. I also have a bleeding heart tetra whose nose turned solid black, but he's been that way for years and still seems fine. I couldn't get a good picture of him to put up. Is there any reason multiple fish would come down with the same thing?
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