I've never had that problem. I keep them as small groups - 2-3 of each - bar/blue gudgeon/scissor tail, etc. Never had a problem with them killing each other. Carpet surfing, on the other hand, is another story.
I have a 90, big enough to keep 3 chromis alive for almost 2 years.
Mostly I am looking for interactions between fish. I think I am good but I also thought a kole and a lawnmower blenny would be fine untill I actually asked. Turned out it was common for the blenny to end up dead but no one advertised that on the forum here.
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