Evilest Fish???

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At 2'' my fahaka killed a 14'' pleco over night. So that gets my vote. I have owned most cichlids and alot of oddballs and I can tell you that a aro or any cichlid I know of is no where near a fahaka in aggressiveness.
 
The Ornate Bichir I owned for a week. I couldn't figure out what was happening until I snuck out at night to find him slithering around, quietly nipping at everyone's fins. He'd move to a prime location and wait. Someone would swim by and up he'd go, just fast enough to slice the anal or caudal fin. And I was feeding everyone well. He was just a nocturnal fidgeter, I guess. That's why I only kept him for a week. On retrospect, I should've gotten rid of everyone else and kept him. He only cost me $20 at 12". Now I want a bichir...
 
Only because I havnt owned a fahaka, I would have to say a Jardini. The one I had was 6" and fine with a silver that was 14" and a few larger catfish for 3 monthes. Untill I woke up one day and the silver was dead and the jar was just simming along happily. :(
 
Gulper catfish , Tiger shovel nose. They even look evil. EDIT forgot about the demonic fahaka puffers. Puffers are mean little bast****
 
Gars are kinda evil cuz' they will eat anything that is small to fit in their mouths. So if you were to put one in a tank filled with 2" to 4" fish lets say "bye bye" to the fishies.
 
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