Top 10 most aggressive freshwater fish

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If a convict grew to the size of a jag he would kick their butt
 
The electric catfish really deserves a spot on that list, imo.

I saw a 3' long electric catfish with a bite sized Severum, I don't really think they're that aggressive.
 
I saw a 3' long electric catfish with a bite sized Severum, I don't really think they're that aggressive.

maybe they mellow out when they get larger... most electric catfish in tanks don't grow much bigger than a foot long, but in my experience an electric catfish gets a species tank because it will kill anything else in the tank, including conspecifics. Of course, I never had a really big tank like a lot of people on here, so maybe an electric catfish would be ok in a large predator community if there's enough space that the other fish won't die from the stress of frequent shockings. A young ec will seem to give a little shock just about every time it bumps into another fish, which in smaller tanks will just terrorize them to death.
 
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