Hi- I dont have cichilids, but I tried to do the exact same thing with my aggressive goldfish. I call them my "wolf pack" because they regularly pick an omega and pester it until he dies. So I decided to get 6 rosy minnows to see if they would eat them instead of eachother. No such luck. They completly ignored the minnows until they got too big to eat, and now they treat them like pets and still pick on eachother! I still can't believe that my pets have pets. I guess it will just depend on the motivation of the agression rather than anything else. Best of luck!
