So I got a birds nest frag a while back, as my first SPS test piece when I was thinking of having my tank be more of a mixed reef, I have since decided I am more into euphyllia, goniopora and things with more movement. At the time I had some unidentified issues with my lighting setup. I had pretty cheap lights and wrongly assummed because they were cheap that wouldnt be very powerful. That was not the case, the real issue that they have is they have a terrible spread. Anyways I misguidedly placed this birdsnest dead center near the top of the tank. It wasnt happy and started sheading tissue within days of its purchase. I moved it and got a par meter and figured out my lighting issue shortly after. However it didnt survive anyways and I was left with a bone white coral skeleton none the less. I didnt take it out of the tank, and it spent a month or more looking dead and even occasionally covered with algea. A couple of weeks ago I thought I noticed the tips of it looked a bit florescet under the light. But it was hard to tell. Now maybe 20% of it definetly has tissue regrown and polyp extension. By what miracle has this coral respawned? Is this a common thing?