Very misleading thread title. What works for one may not work for another. Fish like humans have their own personality. I currently have 11 Biota Lyretail damsels and they are reef safe in my environment. Prior to these I had 7 Sapphires, 1 Surge, and 1 Azure. Again all are reef safe in my environment. Prior to those I had 3 Talbots. You know the drill, reef safe in my environment.
Amount of rock, coral size (frag vs colony), feeding regiment, and other livestock make a huge difference in both my opinion and experience. I feed hourly between the hours of 0830 and 1830. These feedings are via an auto feeder, mixed blend of Hikari, TDO, and PE Mysis which also includes pellet size. This way everyone has an opportunity to get something. I feed at least 1 frozen feeding which is rotated through my stock. LRS Reef, Nano, Fish, PE Mysis, Brine, Prime Reef, and an angel blend.
Another reefer here,
@ca1ore had 60+ damsels in his 450 mixed reef. Nothing major to report. A mix of Azures and another I forget which.
More often than not damsels in the genus of Chrysiptera are what we are after for both coral and aggression safety. Even then we can't interview the damsel before so they may have that personality...