Definitiely a young Krib. He's an African Cichclid, so he'll be the boss of your Tetras and might nip at the tails of your Swords, but they go along relatively OK in community tanks as Cichlids go. They're usually the most agressive when breeding, like most fish. They like caves for breeding and may nip at your plants, too. I had a breeding pair in a 29 community when I was a kid.