Funny you say this, bought a small Peacock last week. Didn't want to put it in with my massive 10-12" Ornate as it would have eaten it, so put it in with my much smaller Senegals. It was about an inch smaller but very weak as I just couldnt get the thing eating. Woke up the other day and could see the Eel in a very fat Senegal not much longer than the eel was> I was a bit concerned at that, but it seemed to ber acting natuarally. Woke up the day after and the Bichir had died. I was gutted.
Got my Fire Eel in the other tank though, he is heading for the big tank in the future, currently around 8-9" and loves blood worms. Can't seem to get him eating anything else. He sits in the nooks n a massive piece of wood and pops out for food.