What size tank do you have? What are your water parameters? I'm going to guess that your orange fish are Red Zebras (one of the more aggressive mbuna species). They may have worked out their territories with neither fish willing or able to dominate the other. There may also be water quality issues dampening their natural aggressive behavior. However, the Cihligeddon you describe is common in situations in which the fish have not been given enough space to begin with.
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