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plural otos
(informal, fishkeeping) An otocinclus (freshwater fish, genus Otocinclus). quotations examples
All the tetras in my tank (3 species - black neons, Pristellas, and red eyes) died within a 36 hour period. The corys and otos in the same tank are fine.There was no change in water quality, feeding habits, or water temperature. I have no idea why all the tets would die in such a short time span.
1998 January 24, LASP, “Dead tetras”, in rec.aquaria.freshwater.misc (Usenet)