Honestly, for any animal, the more established the tank the better. If you are dealing with serious algae outbreaks or something else that occurs in a new tank, then it will affect the coral, reagrdless of what type of coral it is.
But, with that disclaimer stated, they are really hardy animals, and one of the toughest corals IMHO. That, combined with the color possibilities, make them my favorite coral.
HTH
Stewart