Two shots roughly a year a part I believe. Some changes were made as some corals died as a result of coral warfare. Recently the gold torch died for no apparent reason. The green torch has been struggling with recession or no growth growth for close to a year now. Both were most likely wild specimens as to why they haven’t been able to do well in captivity. The one “boring” torch is the only one that is doing great and of course it’s aquacultured. Goes to show maybe spending the extra $ on aquacultured corals may be worth while. The one big acropora you see on the frag rack actually was almost completely gone at one point. It bleached to a point where there was only some tissue left, I cut the dead skeleton off, did not change a thing, and it has made an amazing comeback.