I sincerely hope this is a joke. What you have is no success, nor are the fish living in harmony. The short amount of time, that you've had them, is nothing.
In the off chance that it's not a joke, you've got aprox. 6 months...maybe, maybe a little longer.
This is obviously a case of not researching, before purchasing, considering the fact that one of those fish you have will be upwards of 30" long, when fully grown.
Dont even bother with the 210gal, if you intend on keeping these fish. Prepare to drop cash for a 750gal - 1000gal tank, or be responsible and return all the fish now. Even with a tank that size, you're gonna have serious territorial issues and major aggression problems, especially from the Titan.