In short: nothing!
All 3 nights we arrived on site at Elbow Reef and set up @7:30pm then got back in the water @ 9:30pm and waited until10:30 or 10:45. We were watching colonies on 3 separate spurs (2 patches are our monitoring sites with >6 different genets that had ramets large enough to spawn. A total of 5 divers (experienced in palmata spawn obs) watching ~30 colonies did not find even a small patch of polyps with bundles and did not observe bundles in the water column. Depth of colonies 20ft or less. Colonies on two of the spurs were observed to spawn in 2005 and 2006.
A second team was observing colonies at Sand Island following the same routine and also saw nothing!