I haven't been able to keep a school of chromiseses (?) in my 92 gal. I started with 3 and was quickly down to 2, I later added 3 more but then ended back at 2 again. The larger one is still aggessive to the smaller one but he seems to tolerate it. The only time I noticed them school was when they were new to the tank of if a new larger fish was added. However once they settled down they went back to fighting. I think some people on this board have had success with multiple chromis but I won't try again until I have a larger tank.
P.S. My ocellaris and pink skunk clowns all go at it so I think non-aggressive is a relative measure with all of these fish!
Ed
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