My Cories are Being Eaten??

Hi everyone,

Here's my _current_ community stats:

6 Black Neons
3 Pepper Cories
2 Plecos

Last night, to my horror, I found two dead fish. 1 Black Neon and 1
Pepper Cory and they seemed to have chunks of them eaten. Another of
my cories has part of his tail missing. What could possibly be eating
them? All of these fish should be fairly peaceful. The cory had a
chunk bitten out of his gill.

The water quality is good and the fish aren't underfed. Could it be my
Plecos?

Help!

Chris