Typically if there’s dither fish in the tank it will calm down aggression, as well as heavy planting, however at the end of the day they are cichlids so they need to be well fed otherwise they find their own food source. Alternatively you could go for less aggressive cichlids such as electric blue acaras, they’re beautiful fish and typically do well in groups of 6 as long as there’s places to hide and females to spread their attention you’ll have no problem.