I lost an entire baseball-sized colony of a pink acro with green tips from an alk swing. It receded all the way to one single polyp with no tissue around it. After over a year of extremely slow recovery, it is now less than 1/4" around and has around 7 polyps. It seams like growth has been really slow but in reality, it has grown 10x its original size in a year. In that same time frame, most of my other corals doubled their sizes.
I probably lost three years of growth but I am very happy that it is going to make a full recovery because the growth pattern/color was beautiful.