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I agree with this although age also has a huge matter with aggression. Along with if it’s already established, I have managed 5 fish and this 6th is the riskiest (Flashing tilefish) with my blue eye kole. My other 5 fish were wrasse, no care in the world (Last time I added a fish was a 0.5” indo Lubbock in September/august). It usually lowers aggression instantly after the first feeding though.I skipped most of this post after the first few, but Tangs do not have to be mean, aggressive or ich magnets. They need fed, have room to hide (like disappear into some rock and not some man-made "caves and arches" that people like so that they cannot really hide) and have an established tank with some real rock or sand that can devour some parasites when/if they fall off of the fish. I have had clown, shoah, 2 blacks, 3 purples, sailfin, chocolate and a few yellows all on a tank and they got along wonderfully, but they all were well fed and had room - FWIW, the blacks, 2 purples, sailfin and the yellows were known coral eaters as they got larger.
Think of tangs like the idiots on reality TV shows... probably perfectly normal under normal circumstances, but stimulate them, don't let them get away for a while and undernourish them and they turn into internet memes and punchlines.