Sounds like tail rot, a bacterial infections, probably brought on by poor
environmental conditions and/or stress. I use Maracyn-Two for tail rot.
Martin Moore, in his upcoming "Three Questions, Moore Answers" column for
American Currents recommends antibiotics in the nitrofuran group, which are
widely used in aquaculture and are absorbed well by fishes, as opposed to
many other popular antibiotics such as tetracycline, which may be effective
only topically.
Chris Scharpf
Baltimore
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