IMO, purple/bluish tinted fish blend too much with my coraline covered rocks (coral beauty here). Blue damsels are mean SOB's after time, trust me on that one. Green chromis in a small school of 3 would add color and are alot nicer. If I could catch my coral beauty, I would replace with a flame angel, and cross my fingers that it is a good one. Angels are a 50/50 chance. How old is your tank and what do you have now?