Frontosa are generally peaceful, gentle giants. They do become a little more aggressive at spawning time, especially if more than one make is present, but even the females will show off and fight.
They require large swimming room. And a large tank eventually. Burundi are I think either the largest or second largest species. The males getting up to 12 inches. There primary diet is fish and crustaceans.
I feed mine, live shrimp. Frozen prawns, mussels, cockles, mysis, daphnia and whitebait. It's expensive but they love it and they are worth it. My potential breeding group is nine strong two males the rest females I believe.
They are hypnotising to watch, and a beautiful species of fish.