The Blue Star Allen's are more peaceful with each other than Green Chromis are. That being said... I did get attacked the odd time when sticking my hand in a certain area of the tank.

+1 i lost a 6" hippo tang,found it few days later under the couch,2 clowns and a chromis..

Stock suggestions for 5.5' shallow reef
 

I lost a purple fire fish and a pistol shrimp. Rest of my fish (flame angel , 2 clowns, azure damsel, banggai Cardinal has all been safe. ). My blue line cleaner warse jumped into the rear sump once a few months back but haven't had a issue since


I actually bought clear mesh for the potential of a top. Just avoiding using/building one :)