Some coral, such as Favia are lower light coral - Not sure what size tank and lights your running but its more than likely recieving too much light and possibly too strong of flow - Moving it lower should help/be the proper location. As mentioned, at night it should put out some sweepers, thats a great time to target-feed it - Its amazing what alil target feeding can do to help revive coral.
Blastos look like a bunch of little tubes with flowers coming out of the top Favia looks like a brain. when they're open I suppose they could look a little bit alike but closed they couldn't really look much different. Try putting both in to Google image and you'll see the difference clearly.