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Le Minh Duy Tran <minhtran at basil_stthom.edu> wrote: <<<<Subject: White
If they are somewhat flattened, and stay on the glass and substrate,
they are probably planaria. If they are hairlike, and swim in a wiggling
motion, they are probably bristleworms of the genus Stylaria. In either
case, they have not been associated with diseases, but rather with
overfeeding. The bristleworms are always around in small numbers.
Nothing really to worry. They are also very resistant to medications. I
like them for tank biodiversity.