I'll get some better pictures once it's settled in but thanks for sharing how aggressive it is.That fish bears more than a passing resemblance to my RT. It's already pretty and will be prettier still with some TLC. I don't have enough experience to guess what it will mature to; I just think it's gorgeous.
FWIW I have found my RT Caligula to be so aggressive even at a young age that he beat several festae and jewel cichlids into submission and / or killed them. He tore apart a female carpintis and bit pictus cats in half... butt end first so he wouldn't get stung. He's in a tank by himself now on account of his tendency to murderize every living creature he comes across.
Do you think a fish like this would care for a large clown knifefish as a tankmate or just leave it alone? I'm guessing it would probably pick on the CK.