Emerald Dwarf Danio (Danio erythromicron)
£5.99
Compact lower Congo river cichlid with a distinctive head profile, cave-spawning pair behaviour and a primarily molluscan diet. Plan 120L+ for a compatible pair.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Steatocranus gibbiceps
Humphead Cichlid bond and breed in male/female pairs — buying a pair gives them the social structure they need.
Compact lower Congo river cichlid with a distinctive head profile, cave-spawning pair behaviour and a primarily molluscan diet. Plan 120L+ for a compatible pair.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Cichlids are one of the most diverse fish families in the hobby. From tiny apistogrammas to massive oscars, this guide covers the basics of keeping them well.
Maintain these water conditions for optimal health and vibrant colors
Humphead Cichlid (Steatocranus gibbiceps) is a compact river cichlid from Pool Malebo and the lower Congo River, where it lives in flowing, highly oxygenated water and feeds primarily on molluscs. Adults reach about 10 cm total length. Their low, sturdy body, prominent head profile and bottom-focused movement suit life around rock and current rather than open-water cruising.
This is a specialist pair-bonding cave spawner, not a generic “easy dwarf cichlid”. A settled compatible pair can be planned around a mature 120-litre aquarium with useful floor area; use 200 litres or more when adding carefully selected companions or where pair compatibility is not yet proven. Provide several caves, smooth rock, clean oxygen-rich water, moderate-to-strong circulation with resting zones, and a mollusc-led diet supplemented by suitable complete foods. The two size options are approximate dispatch grades and do not guarantee sex, a bonded pair or breeding.
| Care point | Practical target | Why it matters |
|---|---|---|
| Aquarium | 120 L+ pair; 200 L+ community | Territory and floor area matter more than body length alone |
| Temperature | 24-27°C | Matches the published species range |
| pH | 6.5-8.0 | A broad practical range; stability and oxygen take priority over a decimal |
| Hardness | Approximately 5-15 dGH | Moderate mineral content; test source water before adjustment |
| Flow | Moderate to strong, with refuges | Reflects rheophilic ecology without forcing fish to fight one jet continuously |
| Caves | Several, with more than one exit route | Supports refuge, pair choice and cave spawning |
| Food | Mollusc-led varied diet | FishBase records snails/molluscs as the primary natural food |
The source supplier record does not provide water parameters, so the pH and hardness values are practical aquarium guidance rather than a claim that the entire lower Congo holds one chemistry. Measure the aquarium and source water, avoid abrupt changes, and keep ammonia and nitrite at zero.
Steatocranus gibbiceps is a valid species described by George Albert Boulenger in 1899. The supplier records it as “blackspot-hump”, while the customer-facing name Humphead Cichlid describes its distinctive head profile. “Buffalohead”, “lionhead” and “blockhead” are used inconsistently across the aquarium trade, often for Steatocranus casuarius rather than this species.
That ambiguity matters. Similar common names do not make all Steatocranus interchangeable. Species can differ in proportions, adult appearance and captive behaviour. This page keeps the scientific name visible and uses related products only as comparisons, not as synonyms.
The current product title contains no supplier code. The old handle still carried the primary variant code, so the clean route removes that code while preserving an old-handle redirect. Trade provenance does not establish wild-caught, F1, sexed or locality-certified status.
FishBase places the species in Pool Malebo, formerly Stanley Pool, and the lower Congo River, extending downstream towards Matadi in the Republic of the Congo and Democratic Republic of the Congo. The lower Congo contains exceptional rapids, deep channels, strong hydraulic gradients and local habitat boundaries that have promoted diversification among river cichlids.
S. gibbiceps is described as rheophilic: associated with flowing water. That does not mean every square centimetre of its aquarium should be blasted by a wavemaker. Wild river fish use boundary layers, rock faces, cracks and low-flow pockets. A good captive design combines vigorous oxygenation and directional circulation with sheltered places where fish can rest and breed.
Clean water is as important as flow. A powerful pump cannot compensate for ammonia, nitrite, accumulated organic waste or a clogged filter. Build the system around biological capacity, gas exchange and maintainable circulation.
Adults are elongated but robust, with a sloping forehead that can become more pronounced in mature dominant fish. Colour is generally grey, brown or olive with darker patterning rather than the intense blue and red associated with lake cichlids. Individual colour changes with mood, substrate, hierarchy and lighting.
Members of the genus are adapted to hold position close to the bottom in current. Aquarium observers often describe a hopping or perching style rather than continuous mid-water swimming. This should not be confused with loss of balance. A healthy fish moves deliberately between rock and cave, feeds strongly and maintains normal breathing.
The gallery image is a reference-led illustration generated before the current “real reference required” rule. It is preserved because removing existing media is prohibited, but it is not a photograph of current stock or documentary proof of exact colour, sex, hump development or markings.
| Live option | Meaning | Not guaranteed |
|---|---|---|
| 3.5-4 cm | Approximate smaller dispatch grade | Sex, adult head shape or pair compatibility |
| 4-5 cm | Approximate larger juvenile/subadult grade | Male/female selection or a mature bonded pair |
| Two fish | Quantity selected under pair pricing | One male plus one female, bonding or breeding |
Pair bonding is part of the species’ biology, but two unsexed juveniles do not automatically become compatible mates. If buying a small group to allow natural pair choice, the keeper needs a larger aquarium and a plan to separate or rehome fish once a pair establishes a territory.
Do not plan the final aquarium around the 3.5-4 cm dispatch size. Adults reach about 10 cm and defend cave space. Introducing a much smaller fish to an established territorial adult can be unsafe even when both carry the same species name.
A mature compatible pair can be kept in approximately 120 litres when the aquarium is long, well filtered and built around several cave choices. This is a practical floor, not a target for a pair plus a busy community. Use 200 litres or more for companions, uncertain pairing or more complex rock structure.
Length and floor area matter because these fish live and defend territory near the bottom. A tall narrow aquarium may hold the same litres but offer little usable cave spacing. Create two or more separated rock zones so a fish can retreat without crossing the dominant cave entrance.
Two fish still need multiple refuges and an aggression contingency. A divider, mature spare aquarium or realistic rehoming route should exist before signs of incompatibility appear.
Use smooth river-worn rock, stable slabs and caves sized so the fish can enter without scraping its back. Place heavy structures directly on a stable base before adding loose substrate. Every cave should remain accessible for inspection and maintenance; do not create a hidden dead space that traps waste or an injured fish.
Provide several cave shapes rather than one decorative ornament. A bonded pair may select a tight entrance, while an unpaired fish needs a different refuge. Break sight lines with offset rocks and leave a clear path around each territory.
Fine sand or smooth small gravel can work. Avoid sharp crushed material that may injure a bottom-associated fish. Plants are optional and should tolerate the chosen flow; hardy epiphytes fixed to rock are easier than delicate rooted planting. Wood can be used sparingly, but rock and oxygenated open channels are the core layout.
Use a mature filter with generous biological media and enough actual circulation to prevent stagnant pockets. Direct the return along the aquarium length or across rock so the flow spreads rather than striking one cave. Surface movement should be obvious, and warm water at 24-27°C must remain well oxygenated.
A separate circulation pump may help in a larger river layout, but guard intakes and provide resting zones behind rock. Watch the fish: constant struggling, refusal to leave a shelter or being swept during feeding indicates poor flow placement. Rheophilic does not mean exhaustion.
| Observation | Likely issue | Response |
|---|---|---|
| Rapid breathing across both fish | Low oxygen, heat, ammonia or nitrite | Test immediately and increase gas exchange |
| Waste collects behind caves | Dead zone or inaccessible layout | Redirect broad flow and siphon during maintenance |
| Fish cannot feed without being displaced | Jet too concentrated | Diffuse the return and feed in a sheltered current edge |
| Filter flow falls quickly | Mechanical media overloaded | Clean prefilters more often without stripping biology |
| Parameter | Working range | Management note |
|---|---|---|
| Temperature | 24-27°C | Published for the species; choose a stable middle value |
| pH | 6.5-8.0 | Broad practical captive range, not a reason to allow rapid swings |
| General hardness | About 5-15 dGH | Use measured, repeatable replacement water |
| Ammonia | 0 mg/L | Any reading needs immediate action |
| Nitrite | 0 mg/L | Any reading shows biofiltration trouble |
| Nitrate | Low and stable | Use its trend to set water-change frequency |
Start with a weekly 25-35% water change and adjust for feeding, stock and nitrate trend. Match temperature, dechlorinate fully and avoid large conductivity or pH shifts. Test source water before adding mineral products or buffers.
FishBase records molluscs, especially snails, as the primary natural food. The old generic omnivore label therefore hid an important ecological fact. Captive fish can accept quality sinking complete foods and varied frozen invertebrates, but a specialist plan should include safe molluscan material rather than relying on algae wafers.
| Food | Role | Use |
|---|---|---|
| Appropriately sized aquatic snails/mollusc meat | Naturalistic primary item | Use clean cultured sources and match shell/prey size |
| Quality sinking carnivore/cichlid granule | Balanced staple support | Choose a particle taken near the bottom |
| Frozen mysis, krill or similar invertebrate | Variety and conditioning | Chop to size and rotate |
| Artemia or daphnia | Smaller supplemental prey | Useful for juveniles but not the entire adult diet |
Do not collect snails from ponds where pesticides, parasites or pollutants are unknown. Do not offer shells too large or hard for the fish to process. Remove uneaten flesh promptly because high-protein waste can degrade water quickly.
Offer one or two small meals daily to settled adults. Place food where current carries scent towards the cave without sweeping every particle away. Observe both fish; a dominant partner can monopolise the feeding zone.
A healthy adult should remain compact and muscular without a pinched abdomen or persistent swelling. Appetite loss can indicate water trouble, pair aggression, mouth injury or disease. Test water before changing the diet repeatedly.
During conditioning, increase variety rather than simply doubling portions. More food means more filter load, and cave-spawning fish are not helped by dirty substrate or low oxygen.
The species forms pairs and spawns in caves. A compatible pair can coordinate territory defence and brood care, but an incompatible combination may chase relentlessly. “Semi-aggressive” is too vague unless the page explains that most pressure is concentrated around caves, pair formation and breeding.
| Behaviour | Normal context | Intervention signal |
|---|---|---|
| Short chase from cave | Territory boundary | Chasing continues across the whole aquarium |
| Both fish shelter near one cave | Possible pair association | One fish is trapped and cannot feed |
| Digging near entrance | Cave preparation | Rock becomes unstable |
| Stronger defence after spawning | Parental care | Companions are injured or permanently excluded |
Have separation equipment ready before the fish arrive. Catching a victim after dismantling heavy rockwork adds further stress, so design the aquarium with removable sections and accessible caves.
Choose companions that tolerate oxygen-rich moving water, remain away from the cave floor and are too large to be treated as prey. A well-sized group of Congo Tetras may use the middle water in a spacious Congo-style aquarium, but their swimming room and group size must be added to the cichlid footprint rather than ignored.
Some Synodontis share broad African river conditions, but species differ greatly in adult size, activity and appetite. Avoid slow bottom dwellers, tiny fish, ornamental shrimp and anything likely to enter the breeding cave. Large aggressive cichlids can overwhelm this compact species.
Browse the African dwarf cichlid collection for comparisons, then verify each species’ adult chemistry and territory. Similar labels do not guarantee compatibility.
The Lionhead or Buffalohead Cichlid is Steatocranus casuarius, the species most often associated with the buffalohead common name. The Slender Buffalo Cichlid is Steatocranus tinanti. Neither should be relabelled as S. gibbiceps.
These links help with identification and planning, not mixed-species stocking. Closely related cave cichlids can compete for the same floor and refuges, and uncertain hybrid offspring would undermine species records.
A regional theme is more than adding fish whose names contain “Congo”. Start with the physical needs of the Humphead Cichlid: bottom caves, oxygenated flow, feeding access and an adult pair territory. Mid-water companions then need enough uninterrupted length to form their own group without being driven against the glass during breeding. The filtration and water-change schedule must support the combined feeding load.
Congo Tetras are fast, social fish and should be kept as a proper group, not as two decorative dithers. Their adult swimming space pushes the sensible community aquarium above the pair-only floor. A 200-litre minimum is therefore a planning threshold, not permission to fill every level. Check the final dimensions, filter capacity and actual number of fish.
Bottom-dwelling catfish need more caution. “Synodontis” covers species with very different adult sizes and behaviour. A nocturnal catfish that repeatedly enters the spawning cave can trigger constant defence, while a large species can dominate food and shelter. Research the exact species rather than using a genus name as a compatibility guarantee.
Do not mix West/Central African river fish with Lake Malawi or Tanganyika cichlids merely because all are African. Their social strategies, diets and habitat use differ, and the Humphead Cichlid gains nothing from the aggression or carbonate-heavy design of a generic Rift Lake display.
High circulation can make water look exceptionally clear while dissolved nitrate and organic compounds still accumulate. Visual clarity is not a water test. Record nitrate before the weekly change, then adjust the percentage or frequency if the trend rises. A heavily fed mollusc-eating pair may produce more solid waste than its small body size suggests.
Siphon around cave entrances without collapsing the pair’s chosen structure. A narrow hose can reach between rocks, but never probe blindly into an occupied breeding cave. If detritus repeatedly collects somewhere inaccessible, redesign the flow or rock position instead of accepting a permanent waste pocket.
Replacement water should be dechlorinated, temperature matched and reasonably close in pH and mineral content. Sudden cool water or a major conductivity change can stress river fish even when oxygen is high. If tap chemistry changes seasonally, test it before a large change. Mix any required conditioner or minerals outside the aquarium.
Filter maintenance should be staggered. Clean a blocked prefilter or mechanical stage when flow declines, but preserve mature biological media and avoid cleaning every device on the same day. After maintenance, confirm that pumps restarted, surface movement returned and no fish became trapped behind shifted rockwork.
The safest route to a compatible pair may be to raise several young fish and allow a pair to form naturally, but that method creates obligations. It requires more than 120 litres during selection, several distinct refuges and a plan for every unpaired fish. Leaving rejected fish in the pair’s territory is not a neutral outcome.
When only two juveniles are purchased, compatibility remains uncertain. Watch whether both fish can feed, use shelter and cross the aquarium without prolonged pursuit. One fish remaining pale in a top corner, breathing rapidly or emerging only after lights out is not evidence of a successful pair. Separate early, before torn fins and weight loss make recovery harder.
A divider must allow safe water flow without permitting biting through gaps. A mature spare tank is better for longer separation. Rearranging caves can reset territory temporarily, but it does not turn an incompatible sex or personality match into a bond. Retail “pair” language should always be read as quantity unless the listing explicitly documents a sexed, bonded pair.
A compatible pair deposits eggs inside a cave and both parents participate in brood defence. Provide several cave options with entrances the adults can defend. Stable oxygen and clean substrate are more important than changing temperature to force spawning.
Do not assume two purchased fish are a pair. Natural choice from a juvenile group can be more reliable, but requires a larger aquarium and a removal plan for unpaired fish. Once a pair breeds, community aggression may increase sharply.
Fry can be offered appropriately sized Artemia nauplii, microworms and fine complete fry food once free swimming. Protect intakes, feed tiny amounts and maintain oxygen without directing a harsh jet into the brood cave.
Warning signs include rapid breathing, clamped fins, rubbing, persistent hiding without feeding, white faeces, wounds, swelling or loss of balance. First check temperature, oxygen, ammonia, nitrite and recent chemical changes. Medication cannot correct an environmental failure.
Quarantine new fish in a mature covered system with matched water and suitable shelter. A bare box without caves can create abnormal stress and aggression. Use dedicated equipment and observe feeding before introduction to the main rockwork.
The species’ bottom-focused movement can look unusual, but a fish that rolls, cannot hold posture or is swept helplessly requires attention. Compare behaviour with respiration and appetite rather than diagnosing from one movement.
| Interval | Task | Record |
|---|---|---|
| Daily | Check breathing, feeding and access to caves | Any fish excluded or injured |
| Weekly | Test nitrate and change 25-35% as required | pH, temperature and volume changed |
| Weekly | Siphon waste around rock edges | Repeated dead spots |
| As needed | Rinse mechanical media in removed tank water | Flow before and after cleaning |
| Monthly | Check rock stability, pump guards and cave access | Movement or blocked exits |
Cycle the final or quarantine aquarium before dispatch. Confirm caves, stable temperature, zero ammonia/nitrite and a guarded filter. Be present to receive the parcel and follow the current live-fish delivery terms.
Shipping-bag chemistry changes during transit, so follow the order-specific acclimation instructions and do not extend the process casually after opening. Keep lighting low, discard shipping water and transfer without prolonged chasing. The acclimation timer can help organise the steps.
Use the tank-volume calculator, water matcher, tank-mate planner and cycle tracker before ordering. These tools support, but do not replace, species-level judgement.
The single preserved gallery image is a 1024 x 1024 reference-led illustration created when the supplier record had no usable source photograph. It is not the exact fish dispatched and should not be used as proof of sex, adult hump size, colour or markings. Its planted and driftwood elements are visual background, not a lower Congo habitat specification.
Four older sibling-folder renders exist locally, but they are not being uploaded: their provenance and one-image-per-SKU naming do not meet the current media rule. No image is generated, deleted or substituted during this listing repair.
| Question | Ready when... |
|---|---|
| Is the aquarium large enough? | 120 L+ for a compatible pair, 200 L+ for a community |
| Are there multiple caves? | Each fish can shelter and rockwork cannot collapse |
| Is oxygenation strong? | Surface movement and circulation remain reliable at 24-27°C |
| Is the diet ready? | Safe molluscan foods and a balanced sinking staple are available |
| Is pair risk managed? | A divider, spare tank or rehoming route exists |
| Can the delivery be received? | A responsible person can inspect and acclimate promptly |
No. Buffalohead or Lionhead most often refers to Steatocranus casuarius. This product is the valid species S. gibbiceps.
FishBase records a maximum of approximately 10 cm total length.
Plan at least 120 litres with useful floor area and several caves. Use 200 litres or more for companions or uncertain pairing.
No. Size grades are not sexed unless explicitly stated, and pair pricing guarantees quantity only.
It needs excellent oxygen and useful circulation, but also sheltered resting and breeding zones. Do not blast the entire aquarium with one jet.
Published biology describes a primarily mollusc-eating fish. Use safe cultured molluscan foods plus balanced sinking food and varied aquatic invertebrates.
A proper Congo Tetra group can be considered in a spacious 200 L+ river community with enough mid-water room, but compatibility remains conditional.
Ornamental shrimp are not recommended because this cichlid is an invertebrate feeder and defends bottom territory.
Yes. Caves provide everyday refuge, pair territory and the spawning site. Offer several secure choices.
A compatible pair deposits eggs in a cave and both parents care for and defend the brood.
Maintain 24-27°C, with stability and oxygenation more important than chasing the warmest value.
It is better for an intermediate keeper comfortable with pair aggression, cave territories, flowing water and a specialist diet.
Bottom-focused, stop-start movement is associated with the genus’ river lifestyle. Loss of posture, rolling or helpless drifting is not normal.
No. The preserved image is a reference-led illustration. The dispatched fish can differ in sex, maturity, head profile and colour.
18–28°C · pH 6.5–8 · 20L
22–26°C · pH 6–7.5 · 60L
24–28°C · pH 7.5–8.5 · 500L
22–26°C · pH 6–7.5 · 150L
24–28°C · pH 6.5–7.5 · 2000L
24–28°C · pH 5.5–7 · 60L
24–27°C · pH 7.5–8.8 · 150L
24–28°C · pH 7.5–8.5 · 40L
23–27°C · pH 5.5–7.5 · 80L
24–28°C · pH 8–9 · 300L
20–25°C · pH 6–7.5 · 80L
20–25°C · pH 6–7 · 60L