anybody know what it is???

  1. Mark Z.

    Internal Parasite?

    Hi,   For the past year or so, I have been dealing with this problem off and on and I can't figure out what it is.   I have a small school of Congo tetras in my 48 gallon. Sometimes, one or more will have what appears to be a very small thing trailing out of its anus. I don't even know how to...