That is part of it. Also using all males of simular size, not adding one fish at a time but many.Oh, I had thought it was done with a method like with Africans. by overstocking.
Not for your bigger cichlids, but if you went small cichlids you could do a nice mix. Think Amatitlania family, Convict, HRP, Nanolutea etcAssuming that this wouldnt be possible in a 75