OB Peacock Cichlid Care Guide: Colors, Diet, and Tank Mates

Species Overview#

The OB Peacock Cichlid (Aulonocara spp. hybrid) is one of the most visually striking African cichlids you can buy at a typical local fish store, and it owes its existence entirely to human intervention. "OB" stands for Orange Blotch — an irregular calico-style patterning of orange, black, and blue patches scattered across an otherwise peacock-blue body. The pattern is genetic, but it does not occur in any wild Aulonocara species. Every OB Peacock you have ever seen was descended from a deliberate cross between a Mbuna female (most often Labeotropheus fuelleborni) and a male Peacock cichlid, and the resulting hybrid line has been refined over decades of selective breeding into the fish you see in stores today.

Native ancestry traces to the rocky and sandy intermediate zones of Lake Malawi, where wild Aulonocara species (the "peacocks") sift sand for invertebrates while Mbuna graze the algae-covered rocks above them. The OB Peacock combines the body shape and feeding behavior of the peacock side with the Orange Blotch color gene from the Mbuna side. The result is a fish that requires the same hard, alkaline water as both parent groups, but whose temperament and best tank-mate selection sit somewhere in between — and that "in between" is exactly what makes them tricky to stock correctly.

Adult size

5-6 in (13-15 cm)

Lifespan

8-10 years

Min tank

75 gallons (harem)

Temperament

Semi-aggressive

Difficulty

Intermediate

Diet

Carnivore (insectivore)

The "Orange Blotch" Genetic Hybrid (Aulonocara x Mbuna)#

The OB pattern is sex-linked and behaves more like calico genetics in cats than the simple color genes that govern most cichlid morphs. The original cross paired a female Mbuna carrying the OB gene with a male peacock, and the resulting offspring inherited the patterning but largely kept the peacock body shape and feeding behavior. Subsequent generations have been line-bred and back-crossed to enhance color contrast and pattern density, and most modern lines breed reasonably true to type. Modern variants include the OB Strawberry Peacock, OB Sunshine Peacock, and OB Red Shoulder Peacock, each emphasizing slightly different background colors beneath the blotched pattern.

For practical purposes, the genetic origin matters in two ways: hybrid fish do not breed reliably true (expect significant variation in fry), and reputable wild-strain Aulonocara breeders consider OB lines off-limits for any purist breeding project. If you want a fish that looks spectacular and is hardy at the LFS, the OB Peacock is a strong choice. If you want to breed wild-type Aulonocara nyassae or A. stuartgranti, an OB Peacock will contaminate your line in a single generation.

Size and Lifespan (5-6 inches; 8-10 years)#

Adult OB Peacocks reach 5 to 6 inches at full size, with males running larger and more robust than females. They grow steadily for the first 18 to 24 months and reach reproductive maturity around 12 to 14 months. With proper care — stable parameters, an appropriate diet, weekly water changes, and minimal aggression-driven stress — they routinely live 8 to 10 years in the home aquarium. Fish kept in marginal conditions or fed a poor diet often die in years 3 to 5 from cumulative organ damage related to chronic Malawi Bloat episodes or unstable pH.

Sexual Dimorphism: Identifying Males vs. Females#

Sexing OB Peacocks is harder than sexing wild Aulonocara because the OB pattern can mask the underlying sexual coloration. In standard peacock species, dominant males develop intense iridescent blue, red, or yellow coloration while females stay drab gray-tan. In OB lines, both sexes carry the orange blotching, so color saturation is a less reliable sex indicator.

The most consistent markers are body shape (males are deeper-bodied and develop slightly elongated dorsal and anal fin extensions), egg spots on the anal fin (males display bright yellow-orange spots used in mouthbrooding courtship; females either lack them or show much fainter ones), and overall size at maturity (males average 1 to 1.5 inches larger than females). Juvenile sexing is unreliable — wait until fish are 4 inches before trying to confirm sex.

Water Parameters & Tank Requirements#

OB Peacocks share parameter requirements with both parent groups, which means hard, alkaline, mineral-rich water is non-negotiable.

Minimum Tank Size: Why 75 Gallons is the Baseline for a Harem#

A 55-gallon tank is the absolute minimum for a single male OB Peacock kept with one or two females, but that footprint is too cramped for the harem dynamic these fish prefer. The practical baseline for a 1-male-to-3-or-4-female harem is a 75-gallon tank (48 inches long), which gives the male enough territory to display and the females enough escape routes when his attention turns aggressive. For mixed peacock or peacock-Hap communities, jump to a 125-gallon (72 inches long).

Footprint matters more than total volume. A 75-gallon long tank dramatically outperforms a 75-gallon tall in cichlid keeping because the fish use horizontal territory, not vertical. See the aquarium dimensions reference for the full footprint comparison.

Filtration: Over-filtering for High Bio-loads#

Peacocks eat well and produce a heavy bioload to match. Over-filter rather than under-filter. A canister rated for 1.5 to 2 times tank volume is the standard recommendation, or run two large hang-on-back filters in parallel. Aim for total turnover of 6 to 10 times the tank volume per hour. Direct outputs to create moderate flow along the rock and sand surfaces, mimicking the wave-driven water movement of the lake's intermediate zones.

Weekly water changes of 25 to 30 percent are mandatory. The high bioload of a packed cichlid tank means nitrate climbs fast, and chronic high nitrate is a leading trigger for the immune-suppressed bloat that wipes out tanks in a week.

Diet & Feeding#

This is where OB Peacock care diverges from Mbuna care, and where keepers who treat them like a Red Zebra get into trouble.

High-Protein Pellets vs. Spirulina Balance#

OB Peacocks inherit the carnivore-leaning gut of their Aulonocara parent, which evolved to sift invertebrates from the sand. They tolerate and benefit from a higher-protein diet than pure Mbuna can handle — but the Mbuna genetics in their lineage means their digestive system is still less robust than a true insectivore peacock. The safe approach is a balanced diet built around a quality cichlid pellet with moderate protein (35 to 45 percent) and supplemental spirulina, with occasional frozen treats.

Build the daily diet around a pellet like New Life Spectrum Cichlid Formula, Hikari Cichlid Bio-Gold, or Northfin Cichlid. Feed twice a day in small portions the fish can clear in two minutes. Rotate spirulina flakes or pellets in once or twice a week to add fiber and keep the gut flora balanced.

Avoiding "Malawi Bloat" through Proper Fiber#

Malawi Bloat is the species-specific killer for any Lake Malawi cichlid. It is caused by an overgrowth of pathogenic gut bacteria, usually triggered by an inappropriate diet (too much protein, not enough fiber), poor water quality, or stress. Symptoms include a swollen, distended abdomen, loss of appetite, listless hovering near the substrate, stringy white feces, and rapid breathing. Once symptoms are obvious, treatment is difficult and mortality is high.

Prevention is dietary. Even though OB Peacocks tolerate more protein than pure Mbuna, feeding bloodworms or beef heart as a regular staple still triggers bloat in a meaningful percentage of fish. Keep protein moderate, include fiber-heavy spirulina or vegetable supplements weekly, and skip beef heart entirely.

Live and Frozen Treats (Mysis Shrimp and Brine Shrimp)#

Frozen mysis shrimp and brine shrimp are excellent twice-weekly treats. They are high-protein but low-fat compared to bloodworms, easy to digest, and rich in carotenoids that enhance the orange blotching. Avoid bloodworms and tubifex as regular foods — both have been linked to Malawi Bloat outbreaks even in protein-tolerant peacocks. Live brine shrimp once a week is fine if you have a clean source.

Tank Mates & Compatibility#

The hybrid origin of OB Peacocks makes their stocking trickier than either parent group, because their temperament can lean toward either side depending on the individual fish.

Best Companions: Other Peacock and Flame-Tail Cichlids#

In a properly sized tank (75 gallons or larger), OB Peacocks pair well with other Aulonocara species and with peaceful Haplochromines that tolerate the same parameters. Strawberry Peacocks, Sunshine Peacocks (Aulonocara baenschi), German Red Peacocks, and Flame-Tail Peacocks all work as long as you avoid stocking two males of similar coloration to your OB. Hap species like Copadichromis borleyi (Red-Fin Borleyi) and Sciaenochromis fryeri (Electric Blue Hap) are also compatible in larger tanks and add visual variety.

The harem ratio of 1 male to 3 or 4 females per species is the standard stocking strategy. Heavy stocking with multiple species spreads the dominant male's aggression across many targets and prevents any single fish from being beaten down.

Managing Aggression: The "Overstocking" Strategy#

Like Mbuna, peacock tanks benefit from controlled overstocking. A 125-gallon tank with 15 to 20 mixed peacocks and Haps is often more peaceful than the same tank with 6 fish, because the dominant male has too many targets to focus on any single fish. Pair this with dense rockwork that breaks sightlines, plenty of caves for subordinate fish to retreat into, and a solid female-to-male ratio across all species in the tank.

This strategy only works with robust filtration and weekly water changes. Heavy stocking in marginal water quality is the formula for a Malawi Bloat outbreak.

Species to Avoid: Why Mbuna and South Americans Don't Mix#

Skip the Mbuna pairings even though OB Peacocks share genetics with them. Mbuna are more aggressive and faster eaters, and they will outcompete OB Peacocks at feeding time. Worse, Mbuna males may try to breed with female OB Peacocks, producing further hybrid generations. The peacocks that work alongside OBs in shared tanks are other Aulonocara, not Maylandia or Pseudotropheus.

The Red Zebra Cichlid is a classic Mbuna that is sometimes proposed as a tank mate but in practice causes the problems above. Larger Tanganyikan species like the Frontosa Cichlid need cooler, deeper-water setups and a calmer tank dynamic that does not mesh with the constant peacock activity. Avoid all South and Central American cichlids — the parameter mismatch alone (soft, neutral water vs. hard, alkaline) makes any mix doomed long-term.

Breeding the OB Peacock#

Mouthbrooding cichlids breed readily in the home aquarium. The bigger problem is what to do with the fry, especially when the parents are themselves hybrids.

Mouthbrooding Behavior and Gestation#

OB Peacocks are maternal mouthbrooders. The male displays in front of a chosen female, leading her to a spawning pit he has cleared in the sand. She drops a few eggs at a time and immediately picks them up in her mouth. The male flares his anal fin to display his egg spots, the female mistakes them for her own eggs and tries to pick them up, and in doing so triggers the male to release sperm into her mouth, fertilizing the clutch.

The female then carries the eggs in her buccal cavity for 18 to 24 days, during which she stops eating entirely and develops a noticeably distended throat. When the fry are fully developed she releases them in a sheltered cave area. They are immediately free-swimming and can feed on baby brine shrimp, crushed flake, and powdered fry food.

Setting up a Fry Grow-out Tank#

If you want to raise the fry, move the holding female to a separate 10 or 20-gallon release tank a few days before her expected release date. This protects the fry from being eaten by tank mates and gives the female a few days to recover before rejoining the colony. A holding female who is harassed back to spawning condition too quickly will lose body condition fast.

Fry grow at roughly 1 inch per 2 to 3 months under good conditions. Because OB Peacocks are hybrids, expect significant variation in fry coloration — some will show the OB pattern strongly, some will look more like solid-color peacocks, and some may resemble the Mbuna ancestor. Sort and cull (or sell as feeders) fry that do not meet your line standard if you plan to continue breeding.

Common Health Issues#

The two diseases responsible for nearly all OB Peacock losses are both preventable.

Identifying Ich and Velvet in Blotched Patterns#

Ich (Ichthyophthirius multifiliis) presents as small white spots scattered across the body and fins. The catch with OB Peacocks is that their natural blotching can include light-colored patches that look superficially similar to ich. The reliable test is whether the spots are raised (ich is, the natural pattern is not) and whether they appear fresh (ich spots increase in number day-over-day). Treat ich with a heat-and-salt protocol (raise to 86°F for 10 days, add aquarium salt at 1 tablespoon per 5 gallons) or a copper-based medication in a quarantine tank.

Velvet (Oodinium) presents as a fine gold or rust-colored dust coating on the body, often more visible under a flashlight than under tank lighting. It is more aggressive than ich and requires copper treatment. Both diseases enter the tank on un-quarantined new fish — a 4-week quarantine period for any new arrival eliminates the risk almost entirely.

Treating Malawi Bloat and Swim Bladder Issues#

Malawi Bloat treatment is metronidazole-medicated food, dosed at 100 mg per 10 grams of food for 5 to 7 days. Even with prompt treatment, mortality is high. Swim bladder issues — fish floating sideways or unable to maintain depth — are usually secondary to bloat or to a parameter problem (sudden pH swing, ammonia spike). Check water parameters first, then treat for bloat if the abdomen is distended.

Prevention beats treatment. Feed a diet appropriate for the fish, maintain stable parameters, perform weekly water changes, and quarantine new arrivals. Tanks that follow this protocol rarely see bloat or related complications.

Where to Buy & What to Look For#

OB Peacocks are widely captive-bred and stocked at most stores that carry African cichlids. Sourcing a quality specimen takes a little discrimination but the species is rarely hard to find.

Assessing Color Intensity and Fin Health at Your LFS#

The "Pattern Lottery" is real with OB Peacocks. Because the underlying genetics shuffle each generation, no two fish look identical, and the color contrast between high-quality and mediocre specimens is dramatic. Look for fish with bold, well-defined orange blotches against a deep blue background — not pale, washed-out orange against gray. Avoid fish whose blotching looks muddy or whose blue base color appears faded.

The Importance of Quarantining New Arrivals#

A 4-week quarantine in a separate 20-gallon tank with sponge filtration and matching water parameters eliminates the majority of disease introductions. Quarantine is not optional for fish entering an established cichlid community — a single ich or velvet outbreak in a fully stocked 125-gallon tank can wipe out months of stocking work in days.

Acclimation#

Drip-acclimate over 60 to 90 minutes. The pH and hardness shock when moving from a typical store tank to a properly buffered cichlid setup is significant, and even a hardy fish needs time to adjust. Test your tank water and the bag water before you start, and if the difference in pH is greater than 0.5 units, lengthen the drip period. See the acclimation guide for the full procedure.

Quick Reference#

• Tank size: 75 gallons minimum for a 1M:3-4F harem; 125+ gallons for mixed peacock community
• Temperature: 76-82°F (24-28°C)
• pH: 7.8-8.6
• Hardness: 10-25 dGH, 10-20 dKH
• Substrate: Aragonite sand or crushed coral
• Diet: Carnivore-leaning omnivore — moderate-protein cichlid pellets, occasional mysis and brine shrimp, weekly spirulina
• Tankmates: Other Aulonocara peacocks, peaceful Haps, Synodontis catfish
• Difficulty: Intermediate — easy parameters to hit but non-negotiable
• Lifespan: 8-10 years
• Watch for: Malawi Bloat, hybrid temperament variation, washed-out color from poor diet

For broader context on starting a freshwater tank capable of housing an OB Peacock harem, see our freshwater fish overview.