Cichlids are more aggressive and will usually take out their aggression on their tankmates. If the dat is there only tankmate, it will be targeted. I would recommend a much larger tank with more cichlids so they can target each other. Also, I would recommend that the dat be much larger than the cichlid. Female doviis aren't going to be as large or as aggro as the male dovii, but that combo sounds pretty risky. It may work for a short time, but don't count on it.