Peacock cichlids from Lake Malawi are group fish with rules. A number alone tells you little, because eight males, one male with five females, and two males with two females are three completely different tanks wearing the same head count. Get the structure right and peacocks give you a wall of colour, males in electric blue, yellow, and red displaying over the rocks. Get it wrong, usually by keeping too few fish or the wrong mix, and one dominant male spends his reign hunting the others behind the rockwork while the females hide or fade.
The All-Male Show Tank and Its Numbers
Most peacock keepers choose the all-male route for maximum colour without breeding chaos. It works only with enough males, commonly eight to twelve in a large tank, stocked with different species or colour forms so no two look alike, since similar-looking males read as rivals. Numbers spread aggression: with a crowd, the dominant fish cannot single anyone out for long, and chased males slip back into the group. All-male tanks are typically stocked heavily and filtered accordingly, with all fish added young and close in size. Expect some males to colour fully and subordinates to stay muted, which is the honest trade for a peaceful crowd, and rearrange the rockwork if one fish begins ruling a corner too hard.
The Harem Alternative: One Male, Several Females
A species harem shows natural behaviour the show tank cannot: one male in full colour holding a territory among the rocks, courting a group of females who mouth-brood eggs and carry fry in their mouths for weeks. Stock at least four females to one male, because a male peacock courts constantly and one or two females get no rest. Females are drab silver-brown, and each species' females look nearly identical, so harems suit keepers who value behaviour over a rainbow and who keep one species per tank to avoid cross-breeding that muddies the lines. Provide rock caves for refuge and a plan for fry before the first female is holding.
What Never Works: Pairs and Sparsely Stocked Rivals
A pair of peacocks is the classic beginner error. The male courts and chases without pause, the single female hides, stops eating, and eventually succumbs to stress. Two males with a couple of females combines every problem at once: the males fight, the females get harassed by both, and the weaker male lives in exile at the surface. Small groups fail for the same reason small cichlid groups always fail, too few fish to dilute a hierarchy that this genus enforces vigorously. If your tank can only hold a few fish, peacocks are the wrong choice, and a calmer species will reward you far more.
Managing a Group That Changes as Males Mature
Peacock stocking is not set-and-forget. Young males colour up and challenge the order, a bully may need removing, and females in a show tank sometimes turn out to be mislabelled young males. Rockwork with many caves and broken sightlines buys peace during every reshuffle, and shifting the rocks during water changes resets territories when tension climbs. Keep a dated stocking list of who is in the tank, by species and sex, because decisions about adding or removing a fish depend on the current structure, not on how the tank was stocked originally.
That evolving list is exactly the sort of thing households lose track of between them, and KinsLe Family Sharing keeps the peacock group's current males, harems, and planned changes in one shared profile everyone at home can consult.