The Blue Devils will chase them away every time the Chromis swim by. It will ba a perfectly natural thing and nothing to worry about. I believe it may even make the Chromis shoal tighter and look better.
how many schooling fish could I have in my 55 gal..............do I still go bye the 1 inch per 5 gallon rule? because if they are schooling, wont they be used to being so packed?