Apistogramma diplotaenia

By Pet Zone SD Team • October 2026

Overview

Apistogramma diplotaenia — the Doublebanded Dwarf Cichlid — is a rare middle-Rio-Negro blackwater specialist that's been in the hobby since 1981 without ever becoming common. The German collector and exporter Horst Schmettkamp first brought it into the trade that year; Swedish ichthyologist Sven Kullander didn't formally describe the species until 1987, six years later — a science-lagging-trade pattern seen elsewhere in this genus (see barlowi and megastoma, both traded under other names for years before formal description). The name "diplotaenia" is Greek for "double band," describing the black double stripe running the length of the body — which is essentially the same meaning as "bitaeniata" ("two-striped"), already covered on this site. The two are not the same fish or even close relatives in a practical sense; the overlapping names are just two different authors independently describing the same obvious marking.

Diplotaenia comes from the middle Negro River between San Carlos and the Arirará River, with its type locality downstream of the Rio Daraã in eastern Amazonas, Brazil — classic Rio Negro blackwater, among the softest and most acidic habitat any Apistogramma occupies. It remains rare both in nature and in the trade: decades after its hobby debut it's still hard to find, expensive when available, and documented breeding accounts are scarce enough that most of what's known about keeping it comes from a small number of dedicated reports rather than widespread keeper experience.

Color & Identification

The signature mark is a black double stripe that runs the length of the body, meeting behind the eye at the front and converging again just before the tail — the feature both the common and scientific names describe. Males carry most of the color: blues, yellows, and reds concentrated in the fins against a white-to-silver body, a low dorsal fin with the first few spines separated and a filament trailing off the rear tip, and a rounded tail marked with colored bars that arc along its outer edge. Females stay plainer outside of brooding, in the usual Apistogramma pattern. The body itself runs elongated for the genus, with a depth of roughly 25–28% of standard length rather than the stockier profile of a species like cacatuoides.

Tank Setup

A single breeding pair does fine in a 20-gallon tank — this species doesn't need the long footprint some other rare apistos on this site demand. One documented setup kept a pair successfully on fairly simple furnishings.

• Substrate: No gravel. A bottom covered in oak leaf litter, left to break down and gather a thin layer of hair algae, got better results than a cleaned, gravel-bottomed setup.
• Hardscape: Sunken driftwood or locust wood plus several clay pots for cover and potential spawning sites.
• Filtration: A simple sponge filter is enough — gentle flow, no need for anything stronger.
• Water changes: Frequent and modest — around 30% twice a week kept the breeder's pair stable, closely matching the soft, acidic water they were already in rather than shocking them with a harder refill.
• Leaf litter and tannins: Not optional here. Between the acidity this species needs and its natural blackwater habitat, oak or similar leaf litter does double duty holding pH down and giving the fish cover.

Feeding

Diplotaenia isn't fussy about food — one keeper's adults took almost anything, including dry flake. A simple split works well: dry prepared food (flake or freeze-dried) in the morning, live or frozen food in the evening, with newly hatched brine shrimp worked in every couple of days to help condition a breeding pair. Fry start on microworms, moving to newly hatched brine shrimp after their first few days and staying on microworms as a supplement for about three weeks; juveniles up to two months take brine shrimp and finely chopped white worms before graduating to crushed or chopped adult foods. See our general feeding guide for more on conditioning diets genus-wide.

Temperament & Compatibility

Unlike the harem-breeding apistos on this site, diplotaenia has been kept and bred as a single pair in one tank. The male patrols the tank's perimeter while the female tends eggs and fry, and the pair can coexist peacefully through the first couple of weeks of free-swimming fry — but reports describe the male starting to harass the female once the fry are a few weeks old, at which point removing him let the family finish raising the brood without incident. Given how rare and valuable this species is, it's worth watching that transition closely rather than assuming the peace will hold. As with the rest of the genus, avoid mixing with other Apistogramma species and stick to calm dither fish that stay out of the breeding pair's territory.

Breeding

The formal species description places diplotaenia as a standard cave spawner — eggs laid on a cave ceiling and tended by the female — but the fullest hobbyist breeding account on record tells a different story: that pair spawned out in the open on a patch of oak leaf litter, not in a cave at all. It's not clear whether that reflects genuine flexibility in the species or just one pair working with what they had, so offer caves and clay pots as the safer bet, but don't assume a spawn failed just because it didn't happen inside one. In the documented account, the female guarded the spawn for about six days before emerging with roughly 75 fry, and growth from there was slow even by apisto standards — about a quarter to three-eighths of an inch at one month, just under half an inch at two months. The male patrolled rather than helped directly, and keepers should be ready to pull him if he turns on the female once the fry are established, as covered above. See our general breeding guide for why water stability matters most in exactly this fry-rearing window.

Sourcing Notes

Diplotaenia has been available in the hobby since 1981 and has simply never become common — it's rare in its native Rio Negro range and moves through specialist blackwater-cichlid and apisto importers rather than general retail, so expect to pay a premium and wait for the right shipment rather than finding it on a standard stock list. Because documented breeding is limited, ask any seller directly about the line's history and don't expect a guaranteed sexed pair; buying a small group of juveniles and letting pairs sort themselves out, as covered on our general sourcing guide, is the more realistic approach for a species this uncommon.

Final Thoughts

Diplotaenia is a genuine rarity: in the hobby for over four decades without becoming remotely common, demanding serious blackwater chemistry, and documented by so few breeders that even its spawning behavior isn't fully settled. Its name is also a reminder to read past the label — "double-banded" and bitaeniata's "two-striped" describe the same kind of marking on two unrelated species, so don't assume a shared name means a shared fish. If you already keep a blackwater specialist like baenschi or mendezi and want a genuine rarity to chase next, diplotaenia is worth specifically seeking out from a dedicated apisto importer.

Frequently Asked Questions

What does the name Apistogramma diplotaenia mean, and is it the same fish as bitaeniata?

"Diplotaenia" is Greek for "double band," describing the black double stripe running down the body. That's a near-translation of "bitaeniata" ("two-striped"), already covered on this site — but they're genuinely different species. Bitaeniata is a warmer-water upper-Amazon fish that runs close to agassizii in size and is reasonably available in the trade; diplotaenia is a smaller, rarer middle-Rio-Negro species with a much narrower water-chemistry window and little trade history. The overlapping names are a coincidence of description, not a sign the two are related forms of the same fish.

What water parameters does Apistogramma diplotaenia need?

pH 6.0–6.5 and 75–84°F (24–29°C) covers the general wild range recorded for the species, but it comes from some of the softest, blackest water in the Rio Negro system, and breeders who've spawned it successfully have pushed pH down to 5.5 or lower using rainwater and dilute phosphoric acid rather than relying on tap water alone. Treat the FishBase range as a ceiling, not a target, if you're trying to breed rather than just keep this species.

How big does Apistogramma diplotaenia get?

A documented breeding pair measured males at just over 2 inches (about 5cm) including the tail, with females smaller at around 1.5 inches (3.8cm) — the usual Apistogramma pattern of a larger, more colorful male. (Formal scientific descriptions, which measure standard length without the tail and sometimes work from limited preserved specimens, give somewhat different figures; the hobbyist measurements above are more useful for stocking decisions.)

Is Apistogramma diplotaenia a cave spawner?

Usually, per the formal species description — eggs are laid on a cave ceiling and tended by the female, the standard Apistogramma pattern. But the one detailed hobbyist breeding account on record describes a pair spawning out in the open on a patch of oak leaf litter rather than inside a cave at all, which is unusual for this strictly cave-spawning genus. It's not clear whether that reflects real behavioral flexibility in the species or just one pair's preference when no cave felt right to them, so offer caves and don't be surprised if a pair ignores them.

Where can you buy Apistogramma diplotaenia?

Rarely, and usually at a premium. It's been in the hobby since 1981 but has never become common, stays rare in its native Rio Negro habitat, and moves through specialist blackwater-cichlid and apisto importers rather than general retail. Expect to pay more than for most apistos on this site and to wait for a specialist shipment rather than finding it on a normal stock list — see our general sourcing guide for how to buy a rare apisto without overpaying for an unconfirmed ID.