I have a 120 litre tank and made a beginner mistake and added 4 clowns as my first fish....one jumped, found it dry when the tank wasn't covered (devastated) then one of the others began picking on the smallest. It got to be relentless, really feared for the little guy. Tried hard to get him out (unsuccessfully) then as a last resort I changed my rock scape and added a few more corals and voila! Aggression stopped immediately and to this day they're living in harmony....relief!
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