Love Favias. Some of the hardiest corals out there. I've had this one for about 4 years. I'm not a big fan of Favia frags since they grow slower than many other types of corals but I love the look of a nice sized colony.
Here's my Mystic Grape colony: if my phosphates drop too low I notice the polyps fade slightly. Can almost tell where I'm at without testing just by looking at this coral lol.