When i was young (About 13 at the time) I had a tank of Mixed african cichlids except something that was marketed as a "South American Pike cichlid" Now... Everything in the tank was mean, there were two "King of the tank" fish, the Pike, and a very large african cichlid (unsure of actual name at this point, was years ago) Basically the pike sat hidden in a corner and the african was the "king" of the tank, until the pike wanted to come out and put things in their place... Never had a death in the tank, it managed to work out very well...
Then one day I decided i was going to separate the tank with a glass wall and put something meaner in there... Ok, i was told by my uncle never to get a butterkofferi because they were just too mean. SO i got one just to see, it was a tiny 3" one. Well, about 10 minutes after putting it in the tank (I honestly wanted to see if it would try anything) It began beating the crap out of everything in there, including the african twice its size, and a 10" Pike... So i put him back in the bag so i could slip in the divider. OK lesson learned.
About two months later when it grew about an inch or two it managed to leap from one side to the other during the night... I found him on the main side of the tank, everything dead except the pike.
I think he was afraid of the pike he never actually tried to bite that guy, just the gill flaring and such.
Anyways.... I wont get another, unless its alone. But the more time i spend here, the more Red Devils sound awesome.