Electric yellow cichlid and Red zebra cichlid
Can these two share a tank? The assessment below is derived from stored behavioural and environmental traits, not from a compatibility chart.
Workable only in unusual circumstances. Not a pairing to plan around.
- Minimum volume
- 375 L
- Minimum length
- 165 cm
- Factors considered
- 10
Concerns
Both animals hold strong territories. Two strongly territorial residents in one tank means continuous boundary pressure unless the footprint is large enough to give each an independent area with sightline breaks.
Derived from: traits.territoriality on both records
Electric yellow cichlid becomes markedly more aggressive while spawning. A pairing that has been peaceful for months can change within a day, so plan for where the other animal goes if it does.
Derived from: traits.breedingAggression
Red zebra cichlid becomes markedly more aggressive while spawning. A pairing that has been peaceful for months can change within a day, so plan for where the other animal goes if it does.
Derived from: traits.breedingAggression
Red zebra cichlid needs soft sand it can sift, while Electric yellow cichlid wants rock structure. Both are achievable in one tank, but the substrate choice is not negotiable for the sand-sifter — sharp gravel damages barbels and the damage is permanent.
Derived from: traits.substrateNeed on both records
Why it can work
- Temperature requirements overlap comfortably at 24–28 °C, with room for both animals to sit inside their preferred range.
- pH requirements overlap at 7.6–8.6.
- Hardness requirements overlap at 10–20 °dGH.
- Electric yellow cichlid needs a group of at least 4. Kept in smaller numbers it is not simply lonely — shoaling species held below their threshold show chronic stress behaviour, colour loss and, in several species, increased aggression towards tankmates.
- Red zebra cichlid needs a group of at least 5. Kept in smaller numbers it is not simply lonely — shoaling species held below their threshold show chronic stress behaviour, colour loss and, in several species, increased aggression towards tankmates.
- The two occupy different levels of the tank, which reduces direct competition for space.
Conditions
Most interesting pairings are conditional on something. These are the things the keeper can actually change.
- A long tank with hardscape dividing it into visually separate territories
- At least 4 Electric yellow cichlid, counted as one group
- At least 5 Red zebra cichlid, counted as one group
- At least 375 L with a footprint of 165 cm or more, before counting anything else in the tank
Derived, or documented?
These are different claims and are shown separately. The verdict above is derived from stored traits — arithmetic on AquariumHQ's own records. Whether the pairing is actually reported to work is a separate question, and for most pairs the honest answer is that we hold nothing.
Environmental compatibility
Derived from stored traits
Temperature, pH, hardness, size and behavioural traits compared between the two records. Sound as far as it goes, and it is not evidence that the pairing works.
Behavioural evidence
Widely reported in practice
Reported consistently across aquarium practice without a single citable source. Treated as real but not as measurement.
AquariumHQ's overall position
A standard mbuna combination whose outcome is decided almost entirely by tank length, rock volume and stocking density rather than by the two species involved. The hybridisation is the part that survives good husbandry, and it is the reason mixed mbuna tanks should not be bred from.
What would change it: 120 cm and a great deal of rock. Below about 90 cm the aggression concentrates rather than dissipating.
Factor by factor
- Mbuna aggression and stocking densityReported
Both are rock-dwelling Malawi mbuna and both hold territory. The standard practice — deliberate overstocking so no individual can hold a territory against all comers — is reported consistently and is genuinely counter-intuitive: fewer fish is worse.
- HybridisationReported
Malawi mbuna hybridise readily across genera in aquaria, and Metriaclima and Labidochromis crosses are well known in the trade. Nothing is harmed; the fish stop being either species, and the fry are sold on as one or the other.
- WaterDerived
Identical requirements. Both are lake fish from the same shoreline and there is no chemistry question here at all.
| Depends on | How much |
|---|---|
| Tank size and dimensions | decisive |
| Life stage | minor |
| The individual animal | significant |
How good is the overlap?
Whether two ranges intersect is a necessary condition, not evidence. What matters is WHERE the shared band sits: an overlap at the top of one animal's range and the bottom of the other's is a forced compromise however wide it looks, and it is the case a simple intersection test cannot see.
| Dimension | Assessment | What that means here |
|---|---|---|
| Temperature | Comfortable for both | The shared band 24–28 °C sits centrally in both ranges, with room to drift. |
| pH | Comfortable for both | The shared band 7.6–8.6 pH sits centrally in both ranges, with room to drift. |
| Hardness | Comfortable for both | The shared band 10–20 °dGH sits centrally in both ranges, with room to drift. |
Factor by factor
Every factor states what it rests on. Most are derived from the traits stored on both records — sound arithmetic on AquariumHQ's own data, and not a report about how the pairing actually goes. Where a factor says 'not known', the data is missing and saying so matters, because a missing factor and a favourable one look identical once both are absent.
| Factor | Basis | Finding |
|---|---|---|
| Temperature | Derived from stored traits | Comfortable for both. The shared band 24–28 °C sits centrally in both ranges, with room to drift. |
| pH | Derived from stored traits | Comfortable for both. The shared band 7.6–8.6 pH sits centrally in both ranges, with room to drift. |
| Hardness | Derived from stored traits | Comfortable for both. The shared band 10–20 °dGH sits centrally in both ranges, with room to drift. |
| Body size | Derived from stored traits | Adult sizes are comparable at about 13 cm and 13 cm, so neither is a mouthful for the other. |
| Predation | Derived from stored traits | Highest predation risk in either direction is "high". |
| Territoriality | Derived from stored traits | Strongest territoriality across the pair is "strong". |
| Breeding aggression | Derived from stored traits | Breeding aggression reaches "strong". A pairing peaceful for months can change within a day of a spawn. |
| Fin-nipping | Derived from stored traits | No nipper-and-target combination between these two. |
| Aggression | Evidence-backed | Strongest intraspecific aggression across the pair is "strong". It bears on the pairing because a fish under pressure from its own kind redirects. Reported: Both are rock-dwelling Malawi mbuna and both hold territory. The standard practice — deliberate overstocking so no individual can hold a territory against all comers — is reported consistently and is genuinely counter-intuitive: fewer fish is worse. |
| Social requirements | Derived from stored traits | Electric yellow cichlid needs at least 4; Red zebra cichlid needs at least 5. A shoaling species held below its threshold shows chronic stress and, in several species, increased aggression towards tankmates. |
| Group-size dependency | Derived from stored traits | The outcome depends on group size as much as on the pairing: under-grouped shoalers nip more and hide more. |
| Tank zone | Derived from stored traits | The two use different levels of the tank, which reduces direct competition for space. |
| Activity level | Derived from stored traits | Activity levels are compatible. |
| Food competition | Derived from stored traits | Different feeding strategies, so direct competition is limited. |
| Risk to shrimp and snails | Derived from stored traits | Highest risk either animal poses to dwarf shrimp or snails is "near-certain". |
| Effect on plants | Derived from stored traits | Electric yellow cichlid eats plants, which constrains the aquascape rather than the pairing. |
| Tank dimensions | Derived from stored traits | The more demanding of the two needs at least 250 L and 120 cm of length before anything else is in the tank. Volume alone does not describe a home for a fish that swims in straight lines. |
| Life stage | Evidence-backed | Life-stage dependency: minor. See the documented record. |
| Individual variation | Evidence-backed | Individual variation: significant. |
Environmental overlap
| Parameter | Shared range | Reading |
|---|---|---|
| Temperature | 24–28 °C | Aim for the middle of the shared band. |
| pH | 7.6–8.6 | Stability matters more than the exact figure. |
| Hardness | 10–20 °dGH | Check your source water before committing. |
What this assessment cannot tell you
- Individual temperament varies, particularly in cichlids and in bettas, and can override a favourable verdict for Electric yellow cichlid or Red zebra cichlid.
- The assessment is for the pair in isolation. A third species can change the outcome in either direction.
- Both animals are assessed at adult size, not at the size they are sold.
- A verdict is a statement about probability, not a guarantee.
Where the two water bands meet
Derived from the ranges AquariumHQ publishes for each species. The compatibility engine reads the same numbers; this is what they look like drawn on one axis.
Temperature (°C)
Scale: 0 to 36 °C.
pH (pH)
Scale: 4 to 9.5 pH.
Hardness (°dGH)
Scale: 0 to 30 °dGH.
Why the bands sit where they do
The overlap above is arithmetic. This is where the two numbers came from — the kind of water each animal is recorded from, and how much room that leaves.
Both animals come from lake malawi, which is why the bands below sit where they do.
Electric yellow cichlid
Lake Malawi
the rocky shore of Lake Malawi
200–280 µS/cm · low flow · near saturation oxygen
Red zebra cichlid
Lake Malawi
200–280 µS/cm · low flow · near saturation oxygen
- TemperatureElectric yellow cichlid 23–28°CRed zebra cichlid 24–28°C
Both inside their range from 24–28°C — 100% of the narrower animal’s range.
A wide window. Both animals are inside their own range across most of it, and the tank can be run without either sitting at an edge.
- pHElectric yellow cichlid 7.6–8.6Red zebra cichlid 7.6–8.6
Both inside their range from 7.6–8.6 — 100% of the narrower animal’s range.
A wide window. Both animals are inside their own range across most of it, and the tank can be run without either sitting at an edge.
- General hardnessElectric yellow cichlid 10–25 dGHRed zebra cichlid 10–20 dGH
Both inside their range from 10–20 dGH — 100% of the narrower animal’s range.
A wide window. Both animals are inside their own range across most of it, and the tank can be run without either sitting at an edge.
Computed from the ranges AquariumHQ publishes for each species, each of which records what it rests on — a source value, a habitat inference, a physiological requirement or a trade convention. Most are habitat inferences, and the species pages say which.