My SAL is a bully. He will go up and hit my saddle bichir, florida gar, and clown knife. Some times hitting them so hard it stuns them for a second or two.
my 3 South American lungfish fish are wonderful together but my 2 foot African long African tends to eat just about anything that goes on the Tank eventually although I never see it happen
My African Spotted Lungfish tried to eat my Small Red Tail Catfish 2 times (I was stupid for trusting my lungfish the 2nd time >.<), had to put the lungfish into another tank. My Red Tail Catfish had 1/4 of his scales ripped off, but recovered and eating like a beast now. In my experience, lungfish should be kept alone in a tank, it has a tendency to suddenly kill or eat fish that was with him for years or months.