Cockatoo cichlid

Quick facts

Adult size

8 cm

Lifespan

can live up to 5 years; Apistos are short-lived for cichlids; 3-5 years is typical

Tank zone

bottom

Temperament

semi-aggressive

Difficulty

intermediate

Water parameters

Temperature

24–28°C

pH

5.5 to 7.5

Hardness

1 to 15 dGH

Tank requirements

Minimum volume

75 L

Minimum length

75 cm

Flow

low

Lighting

dim preferred

Substrate

fine

Driftwood

preferred

Hiding spots

needed

Feeding

Diet: carnivore, feeds primarily at the bottom.

Omnivore with a carnivorous preference. Frozen bloodworm, frozen brine shrimp, frozen daphnia, live baby brine shrimp, live blackworms, and high-quality micro pellets. Accepts dry food more readily than most Apistogramma species, which is part of why it's considered the beginner-friendly apistos. Feed twice daily. Live food is essential for conditioning breeding pairs and bringing out peak male coloring.

Compatibility

• The most forgiving Apistogramma for beginners. Tolerates harder water and a wider pH range than A. agassizii or A. borellii. Males are territorial around their cave but the territory is small (20–30 cm radius) and they're not dangerously aggressive.
• Keep one male with 2-4 females. Multiple males need a 120 L tank with distinct territories separated by sightline breaks. Two males in a 75-liter tank results in the subordinate being pinned in a corner.
• Good with small, peaceful mid-water fish: tetras, rasboras, pencilfish. Avoid other bottom-dwelling cichlids in the same tank unless there's plenty of floor space.
• Named for the male's extended dorsal fin rays that resemble a cockatoo's crest. The crest varies by trade variant: "double red," "triple red," "orange flash," and "super red" refer to the amount and intensity of red/orange in the caudal and dorsal fins.

Habitat

Native to the upper Amazon basin in Peru and Colombia. Found in slow-moving tributaries with sandy substrates, submerged leaf litter, and overhanging vegetation. Unlike many Apistogramma that require very soft, acidic water, A. cacatuoides is found in tributaries with slightly harder, less acidic water than typical blackwater species. This broader water tolerance translates to better aquarium adaptability. Males reach 7–8 cm with the dorsal crest extended; females are smaller (5 cm) and turn bright yellow with black markings during brood care. The species was described by Hoedeman in 1951 and entered the hobby trade in the 1970s. Commercial breeding has produced a range of color variants. Wild-type fish have subdued olive coloring with red streaks in the caudal fin; selectively bred variants have dramatically more red and orange. Both wild-caught (from Peru) and tank-bred specimens are available. Tank-bred fish are hardier and better adapted to tap water parameters.

Breeding

Cave spawner with strong female brood care. Provide multiple small caves (coconut shells, clay pots, PVC fittings). The female enters a cave, deposits 40-80 adhesive eggs on the ceiling, and assumes primary guard duty. She turns bright yellow during brood care, which is a warning signal to other fish. The male patrols the outer territory. Eggs hatch in 3-4 days. Fry are moved around the tank by the mother in a tight school, similar to kribensis. Fry eat baby brine shrimp from the first day of free-swimming. In a well-planted community tank, some fry survive predation by hiding in plant cover. In a dedicated breeding tank, survival rates are high. A healthy female spawns every 4-6 weeks. The species is one of the easier Apistogramma to breed and a good introduction to cichlid breeding behavior.

Common problems

Less susceptible to the parameter sensitivity that plagues other Apistogramma species, but still benefits from soft to moderately hard water and low nitrate. Hexamita (hole-in-the-head) appears when water quality is poor or the diet lacks variety. Internal parasites are common in wild-caught fish; treat with praziquantel. Male aggression toward females in small tanks without sufficient caves causes stress injuries and sometimes death. The rule is always: more caves than females, more visual barriers than you think you need. Fin damage from fighting between males heals quickly in clean water. The dorsal crest rays are delicate and can break; they regrow slowly.

Bioload

Bioload coefficient: 1.8 (small bottom-dwelling cichlid; load similar to Bolivian ram per-cm).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size