Alright I couldn't resist a little teasing, but in all honesty I keep alot of large SA/CA fish and careful thought and consideration must be taken. As you can see they can get rough very quickly even as juvies, imagine what a 16" jag could do. I have jags, red terrors, tricmacs and oscars and none can coexist in the same tank, even with my large tanks. They are large, aggressive and extremely territorial. When stocking tanks for the big southern boys there must be say least two breaks in the line of sight which a 55g is hard to do. So my honest and best advice is pick one fish, rehome the rest and concentrate on taking the besig care possible. The cool thing about one fish it's like a water dog where it's entire world is YOU, with no other distractions. Each one of those fish has personality so choose your favorite before one of kills the one you may have wanted to keep. Good luck and let us know what you decide.