There is a good chance they will kill eachother, they are very territorial, I put 10 in my 225 when I first set it up, and I have 1 left. Small schooling fish get aggressive in our tanks, even big home aquariums are nothing compared to the ocean.<a href=showthread.php?s=&postid=8948491#post8948491 target=_blank>Originally posted</a> by bushwick
A tank full of Chromis would look great. I have also been thinking off adding 20-30 fish to my tank. Will add a whole new perspective to the tank. Even 20-30 blue devils or a mixture of both would be nice (but maybe too much agro in mixing them)?