Mala or curu. Curu by itself. Curus don't seem to mix well with its kin. Aimara is a good choice but tank size becomes an issue.
Thoae are some good choices. I would suggest lower jaws for the Polypterus. Something a little bigger as a wolf may eat it like spaghetti. If the fish are small and raised together then it should be fine.
Maybe regular endli,lap, congicus etc.
Other than that it sounds like a nice aggressive tank.