I agree. Unless the jag is more aggressive than average (and provided that the tank is large enough) they should do well together long term. Several years ago I kept a jag with a silver until the aro jumped. The aro went from 7" to 22" in the time that it took the jag to go from 4" to 8", so make sure you get a male jag. An adult aro can eat an adult female managuense imo.