For many of the African cichlids overstocking is a way to control aggression.
Many all male tanks with 2 times the number of fish usually called for.
A strong circulation pump to not allow slow swimming and rearranging tank decorations also helps.
It is believed most cave fish need to have 1 more cave than the number of fish so when the alpha boots the weakling there is an empty nest for him.
I always did well with more cave than fish.
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^My 135 back around 2000 when I kept Tanganyikans.^
Probably had over 800lbs of rock in it~!