10-02-2010, 01:58 PM
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I would suggest it is more likely that something else is killing the various fish, and the plec is simply eating the remains. Many fish will readily eat a dead carcass if they find it. And many species of plec are not strict vegetarians so will not pass up an opportunity as they would have in nature, eating whatever they find along the way.
But having said that, there are pleco species that will kill other fish if they are very small fish and the pleco is large enough. You'd have to provide us with the species and size in order to pursue this. But I am still inclined to the above theory.
As for why the fish are dying, if you post tank size, water parameters (pH, hardness, nitrates, nitrite and ammonia numbers), number and type of fish, someone may have ideas.