I added 2 more damsels today a 2 didnt look right so i disposed of them (RIP) So i added 2 new ones. WELL to my suprise the 1 original one left didnt take to them right of way. I was looking in my tank and i was like "WOW Where did that black damsel come from" Well the one damsel's fin was all perched up and he was BLACK. not slightly black or a little black but dark as night black i watched him for a moment he calmed down fins went down and he slowly changed back to bright ass blue. Not tell me is that normal or do i just have a special magical(LOL) fish