11-26-2009, 07:15 AM
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I have never owned oscars, so do not know personally, how aggressive they can be.
I have peacock eels. Eels can be very shy, and will only come out if they feel very comfortable. My eels, once went into hiding, because I added yoyo loaches to the tank. The yoyo loaches did not pick on them, but tried to take rides on their backs. Even after removing the loaches, it took a couple months before the eels would come back out.
Point being, you could add an eel, but not sure that it would be very happy, or that you would ever see it.