Do you see why they are dying?  Anything look funny about the coral?  I lost one of my torch corals to Brown Jelly disease.  It took out 5-6 branches one at a time within the course of four days.  I didn't know at the time, but a Lugols dip should help with that.  
In your case, check your water parameters.  Might also want to try a Lugols dip too.