My segalal has grown like half an inch in sevrel months. They grow SLOW...Most bichirs will outgrow a 55g tank.
That being said with their growth rate it is going to take them years to do that.
I swear my ornate has not grown in the year + that I have owned him.
African oddball tank, 2 leopard ctenopoma a senegal bichir a ropefish and a couple african butterfly fish and you're set. I have thi setup and love it. Plus they meet all your criteria oddballs and all are predators. When my lfs has a sale on white cloud minnows or ghost shrimp I stock up its a blast to watch them all go hunting
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A gramodes would be cool. They are hard to find in fish stores so you might have to order it. They have the temperment of a dovii. They also look like doviis. The best part is that they only get 7-10 inches long!