After I successfully cycled my Tank I added two Damsel Fish, a Blue Damselfish, and a Yellowtail Damselfish. They both got alone, till two day ago, when I added a Fiji Blue Devil Damselfish. Now the Blue Damselfish has become highly aggressive towards the Yellowtail damsel although they've been together and as for the Fiji Blue Devil, after two days is dead and the tail completely missing.
Now my question is should I get rid of the Blue Damselfish, because her aggression is going to be problematic, and we have a LFS
that buys Damselfish back.