Something to think about when you mention Haitiensis(Black Nasty), is that while dominant males are extremely aggressive, long time owners tend to agree that if the Black Nasty can't dominate, then they tend to stress, get bloat and die. Haitiensis do well mostly in species only tanks. I'd hate to see a beast Black Nasty bloat and die because somebody puts him in a tank with a monster Trimac or Dovii.