I've got 3 blue damsels in my 72. Started with 4, one was a yellowtail. After about a month together I was looking in the tank during feeding and noticed the yellowtail was missing. That was 3 months ago. This past week, I've lost 3 fish to them. A lightning maroon that's been in for 7 months, (saw this with my own eyes and couldn't stop it in time), a lawnmower blenny that was in the tank for about a week, (< 3 inches), and a small foxface that was < 3 inches introduced last week,(also saw this one with my own eyes, my t5 fixture sits on the tank and couldn't move it fast enough to open the glass to remove the foxface).
I can't catch the little buggers, and now what was a 15 dollar expenditure for 4 of them has cost me 200+ in lost fish alone. If I could do it over, I would have never added the blue devil damselfish to the tank. Now I've got to wait for them to kill each other off
I do still have a thunder maroon that runs the tank, and kinda hoping she goes surfing soon as well. Tangs are easier to catch than these fish, and I'm tired of bleeding every time I need to add or adjust a frag