Cylindricus cichlid
A long-bodied rock cichlid shaped to reverse into a crevice, barred black on white and considerably harder-tempered than its ten centimetres suggest. It is a pair fish rather than a colony fish and the pairing is the difficult part.
Quick profile
- Scientific name
- Neolamprologus cylindricus
- Adult size
- 9–12 cm (3.5–4.7 in)
- Lifespan
- 7–10 years
- Temperature
- 24–27 °C (75–81 °F)
- pH
- 8–9
- Hardness
- 12–22 °dGH
- Minimum tank
- 150 L (40 US gal)
- Minimum length
- 100 cm
- Swimming zone
- Bottom
- Social
- Pair
- Diet
- Carnivore
- Overall confidence
- moderate confidence
What keeping this species involves
Hardy and easy to feed. The difficulty is that a bonded pair is intolerant of conspecifics and that forming the pair takes patience and spare fish.
Rock rubble on the shoreline, where the fish wedges itself into narrow horizontal cracks rather than open caves.
Identity and names
- Common name
- Cylindricus cichlid
- Scientific name
- Neolamprologus cylindricus
- Family
- Cichlidae
- Order
- Cichliformes
- Class
- Actinopterygii
- Also sold as
- Neolamprologus cylindricus, cylindricus, zebra lamprologus
Adult size and growth
9–12 cm (3.5–4.7 in)
Typical lifespan in an aquarium: 7–10 years. Almost every animal sold in a shop is a juvenile, so the tank has to suit the size in the first line rather than the size in the bag.
Shape, which is what the compatibility engine reads instead of length alone: deep-bodied with a moderate. Assigned from what is typical of Cichlidae, not examined for this species.
Water and tank requirements
A pair holds a rock territory and drives everything out of it. The footprint is what allows a second territory to exist somewhere the first pair cannot reach.
Temperature (°C)
Scale: 0 to 36 °C.
pH (pH)
Scale: 4 to 9.5 pH.
Hardness (°dGH)
Scale: 0 to 30 °dGH.
Why these ranges: Tanganyikan rocky shore. The chemistry is the lake's throughout and the species shows no depth-related variation worth separating.
Where these figures come from
Habitat class
Lake Tanganyika
An ancient, enormous, strongly buffered rift lake with the most alkaline water any commonly kept aquarium fish comes from.
Not interchangeable with Malawi. Tanganyika is markedly more alkaline and more mineral-rich, and its temperature is markedly more stable, because the lake is deep enough to be its own thermostat.
- Conductivity
- 570–700 µS/cm
- Flow
- low
- Dissolved oxygen
- near saturation
- Seasonality
- weak
These are figures for the KIND of water body, not measurements of this species. They are AquariumHQ’s summary of the general limnology and are given wide because the water is.
- TemperatureReasoned on this record
- This record states its own reason for this band. See the water section.
- pHReasoned on this record
- This record states its own reason for this band. See the water section.
- General hardnessReasoned on this record
- This record states its own reason for this band. See the water section.
| Requirement | Value | Notes |
|---|---|---|
| Temperature | 24–27 °C (75–81 °F) | Stability matters more than hitting an exact figure. |
| pH | 8–9 | A stable pH outside the ideal band is usually better than an unstable one inside it. |
| General hardness | 12–22 °dGH | Check your supplier's published figure before choosing species. |
| Carbonate hardness | 14–20 °dKH | Buffering capacity — what stops the pH moving. |
| Minimum volume | 150 L (40 US gal) | A floor, not a recommendation. |
| Minimum footprint | 100 cm long × 40 cm deep | A pair holds a rock territory and drives everything out of it. The footprint is what allows a second territory to exist somewhere the first pair cannot reach. |
| Water flow | moderate | Match the outflow to this rather than to the filter's rating. |
| Lid required | Recommended | Reduces evaporation and prevents accidents. |
| Structure | Piled rock with narrow horizontal gaps rather than open caves. The body shape is built for crevices and the fish will not use a cave it cannot fill. |
Behaviour
- Reverses into a crevice so that only the head shows, and holds that position while anything unfamiliar is in the tank.
- Moves in short darting runs between rocks rather than swimming across open water.
Telling males from females
Males are larger with a heavier head profile. There is no colour difference and juveniles cannot be sexed reliably.
Feeding
Takes small invertebrates from rock surfaces and from the water immediately above them. Accepts prepared food without difficulty.
- Diet type
- Carnivore
- Staples
- Frozen mysis, Frozen cyclops, Sinking cichlid pellets, Frozen brine shrimp
Breeding
- Strategy
- Eggs deposited deep in a crevice and guarded by both parents
- Difficulty
- straightforward
- Parental care
- guarding
Tankmates and compatibility
Assessments are derived from stored traits by the compatibility engine, with the reasoning shown. A verdict is a statement about probability, not a guarantee — individual temperament can override it.
| Towards | Risk | What it means |
|---|---|---|
| Small fish | moderate | Anything that fits in the mouth is at risk once this species reaches adult size. |
| Adult dwarf shrimp | high | Cover reduces losses but rarely prevents them where the risk is high. |
| Shrimplets | near-certain | Determines whether a shrimp colony can grow rather than merely persist. |
| Snails | low | Applies to snails you wanted as well as snails you did not. |
| Long or trailing fins | occasional | Fin damage is an entry point for secondary infection. |
| Plants | none | Tough species such as Anubias and Java fern survive most grazers. |
Any pair in the catalogue can be assessed with the compatibility checker.
Welfare considerations
Points where the way this species is commonly sold or kept differs from what it actually needs.
- A pair that has bonded will kill an unpaired fish of the same species given time and no escape route. Removing the surplus is part of the method rather than a failure of it.
- Its size gets it recommended for smaller Tanganyikan tanks. It is a small fish with a large temperament and the footprint has to reflect the second of those.
Problems to watch for
Most problems in a tank containing this species are general rather than species-specific. Start with the troubleshooting index and work from the observation rather than from a guess at the cause.
What AquariumHQ does not yet hold
Species-level disease susceptibility is modelled in the graph and is not yet populated. Health pages will not be published until each condition has veterinary sourcing, because health content written without evidence is the most harmful thing this product could publish. The gap is recorded in the coverage report.
Where it comes from
- Native range
- Lake Tanganyika — the south-eastern rocky shore
- Habitat
- Rock rubble on the shoreline, where the fish wedges itself into narrow horizontal cracks rather than open caves.
What the checklists say
2 distribution statements retrieved from GBIF checklists. Establishment means is reproduced from the source where it states one, and left unstated where it does not — a record of presence is not a record of origin.
| Status | Places | What this means |
|---|---|---|
| Recorded as present, establishment means not stated | 2 | The source records the species as present and does not say whether it is native or introduced. AquariumHQ does not fill that in. |
No checklist AquariumHQ holds positively calls this species native anywhere, so the native range above rests on AquariumHQ’s own reading of the literature rather than on a cited checklist.
Evidence
Every stored value with the kind of support behind it and where to check it. Evidence type and confidence are separate axes: an editorial position held confidently and a measurement held tentatively are different things.
| Claim | Value | Evidence type | Confidence | Source |
|---|---|---|---|---|
| scientific name | Neolamprologus cylindricus | Observed / measured | high confidence | Catalogue of Life; GBIF — Global Biodiversity Information Facility |
| native range | Lake Tanganyika — the south-eastern rocky shore | Observed / measured | moderate confidence | GBIF — Global Biodiversity Information Facility |
| adult size | 9–12 cm | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| lifespan | 7–10 years | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| temperature | 24–27 °C | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| ph | 8–9 pH | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| general hardness | 12–22 °dGH | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
| minimum tank volume | ≥ 150 L | AquariumHQ editorial position | moderate confidence | AquariumHQ husbandry synthesis |
| minimum tank length | ≥ 100 cm | AquariumHQ editorial position | moderate confidence | AquariumHQ husbandry synthesis |
| carbonate hardness | 14–20 °dKH | Aquarium-literature consensus | moderate confidence | AquariumHQ husbandry synthesis |
Last reviewed 2026-08-10. Values labelled as an aquarium-literature consensus are AquariumHQ editorial positions rather than measurements — see how evidence is handled.
Why we say this
What each figure on this page rests on, and how far that is from being independently established.
Every figure on this page has a provenance. Open any claim to see what AquariumHQ holds for it, which sources say what, and what a claim of that kind actually needs. Different claims need different evidence: an accepted scientific name is settled by one authority, while a legal restriction needs a current primary instrument. A single source is often the right answer rather than a thin one.
scientific nameAquariumHQ's own position, externally checkableBased on a verified authoritative source.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: accepted scientific name and classification — 1 authoritative source in an appropriate context. Checked against gbif on 2026-08-29. One authoritative backbone is what this class requires.
What would improve this: Go and read a source. This is reachable and has not been reached.
native rangeAquariumHQ's own position, externally checkableLimited evidence — treat with caution.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: where the species occurs — 1 authoritative source in an appropriate context. 2 distribution statements held, and not one of them states an establishment means. Presence without native-or-introduced is not a native-range claim, so this stays below requirement rather than being read as one.
What would improve this: Go and read a source. This is reachable and has not been reached.
adult sizeAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: size a well-kept specimen reaches — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
lifespanAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: what aquariumhq advises for keeping — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
temperatureAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: what aquariumhq advises for keeping — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
phAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: what aquariumhq advises for keeping — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
general hardnessAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: what aquariumhq advises for keeping — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
minimum tank volumeAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: minimum tank size — no external source is required, provided AquariumHQ shows its reasoning. No authority publishes this. AquariumHQ derives it, and the derivation is recorded with its inputs and assumptions.
What would improve this: Keep the rationale current. There is no source to find.
minimum tank lengthAquariumHQ's judgement — no authority publishes thisAquariumHQ's own position, derived from evidenced inputs.
No external authority publishes this. The rationale carries the reasoning.
What this kind of claim needs: minimum tank size — no external source is required, provided AquariumHQ shows its reasoning. No authority publishes this. AquariumHQ derives it, and the derivation is recorded with its inputs and assumptions.
What would improve this: Keep the rationale current. There is no source to find.
carbonate hardnessAquariumHQ's own position, externally checkableAquariumHQ's own position, derived from evidenced inputs.
AquariumHQ's own position on a claim an external source could support.
What this kind of claim needs: what aquariumhq advises for keeping — no external source is required, provided AquariumHQ shows its reasoning. No external source is required for this class. AquariumHQ's position stands on its stated reasoning.
What would improve this: Go and read a source. This is reachable and has not been reached.
Guides relevant to this species
Chosen from this record's own traits rather than listed on every page.
- Predator and prey sizeIt takes adult dwarf shrimp, which decides what can share the tank.
- Territorial behaviourIt defends ground, and the shape of what it defends decides the tank more than the volume does.
- Wild conditions and aquarium recommendationsThe water band on this page is an AquariumHQ position with a stated reason, not a measurement of a river.
- How to read a compatibility verdictThis animal is recorded as nipping fins, which is one of the few compatibility factors with real reports behind it.
Group size and social behaviour
Forms a long-term pair that holds a territory together. Introducing two adults and hoping is how most attempts fail; growing a group of juveniles and removing the fish that do not pair is how it usually succeeds.