adding tangs in 90gal mixed reef

[rayjay]

All I can say is that I had a yellow tang and a powder brown tang in one of my nineties for two years, only to come home one eavening from work to find the brown dead on the bottom, and the yellow died a few days later.
They tore each other up quite badly.
I'd never seen the aggression in that two years, and after it happened, I had plenty of "I told you so"s from other hobbyists.