With what? The dino-eel? I think those are preditory, will eat anything small enough to fit in thier mouth. The ABF is also preditory, but is quite small. Guppies and neons will be a quick snack, but larger peaceful fish will be ok.
How about this? If you want something predatory and agressive. Try the pike livebearer aka Belenesox belizanus. These are the monsters of the Live Bearer world. The female gets up to 9 inches and the male 7. They are pretty mean and prefer live foods. Just look at the teeth in the close up.