The bigger the tank, the better the chance of success. I often put victorians in with malawians when I need space. I have seen large display tanks with Malawian peacocks and julies or lelupi in a rock pile. Other than the obvious water chem. (IME Malawians will survive in water from Victorian to Tanginiakian properties) there are a few concerns, Mouth size rule (skinny tangs often fit nicely in big mouths), both fish getting enough food, and mixing diets, put simple chasing. You wouldn't put tropheus that need greens with julies that need meat unless you could train them to leave the other fish's food alone. You don't want bloat. It can work when the fish don't want the same area. One is from sand and one is from rocks and there is lots of space.
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