Electric yellow cichlid and Frontosa
Can these two share a tank? The assessment below is derived from stored behavioural and environmental traits, not from a compatibility chart.
Should not be attempted. At least one factor is expected to cause harm.
- Minimum volume
- 1200 L
- Minimum length
- 245 cm
- Factors considered
- 11
Concerns
Electric yellow cichlid harasses slow-moving or long-finned tankmates, and Frontosa fits that description. Persistent harassment shows up as hiding, clamped fins and refusal to feed long before it shows up as injury.
Derived from: traits.predation.harassment and traits on the second record
Frontosa reaches about 35 cm and takes fish small enough to swallow. At roughly 13 cm, an adult Electric yellow cichlid is inside that range. This is usually discovered as fish quietly disappearing overnight rather than as visible aggression. Electric yellow cichlid is deep-bodied and Frontosa has a moderate, so Electric yellow cichlid stops being a possible mouthful SOONER than the usual rule suggests — at around 27% of Frontosa's length rather than 40%. The warning stands on what this predator is recorded as doing rather than on the geometry, because a fish that is awkward to swallow whole can still be attacked.
Derived from: traits.predation.smallFish, adultSize on both records, and the stored body form and gape of both
pH ranges overlap only across 8–8.6, which is tighter than most tap-water supplies hold naturally.
Derived from: environment.ph overlap width
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
Temperature requirements overlap at 23–26 °C, though the band does not sit centrally for both animals. Aim for the middle of it and keep the heater accurate.
Derived from: environment.temperature on both records
Electric yellow cichlid defends a territory and both animals use the same part of the tank, so give the territory-holder a defensible area away from the main swimming space.
Derived from: traits.territoriality and zone on both records
Frontosa 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
Why it can work
- Hardness requirements overlap at 12–22 °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.
- Frontosa 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.
- At least 4 Electric yellow cichlid, counted as one group
- At least 5 Frontosa, counted as one group
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
Conditional and generally not worth it. The two lakes are kept apart for reasons that are about temperature and pace as much as about chemistry, and the frontosa is a twenty-year fish being asked to live faster than it does.
What would change it: Stocking the mbuna at a size the frontosa cannot swallow, and accepting that both fish spend their lives at the edge of their temperature range. Neither is a good enough reason to combine them.
Factor by factor
- Gape against a mid-sized mbunaReported
A mature frontosa takes fish up to a surprising size, and a young electric yellow is well inside that. Adults of the mbuna are usually safe; the fish sold at four centimetres is not.
- TemperatureDerived
The frontosa is a deep-water Tanganyikan kept several degrees cooler than a Malawi rock dweller. The overlap is workable and puts both species at the edge of their range, and the cost falls on the longer-lived fish.
- Activity mismatchReported
A slow deliberate predator sharing a tank with a boisterous constantly-grazing mbuna is reported to feed poorly and to show it late. This is the quieter half of why the pairing is discouraged.
| Depends on | How much |
|---|---|
| Tank size and dimensions | significant |
| Life stage | decisive |
| The individual animal | minor |
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 | Workable | The shared band 23–26 °C is usable, though it does not sit centrally for both animals. |
| pH | Workable | The shared band 8–8.6 pH is usable, though it does not sit centrally for both animals. |
| Hardness | Comfortable for both | The shared band 12–22 °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 | Workable. The shared band 23–26 °C is usable, though it does not sit centrally for both animals. |
| pH | Derived from stored traits | Workable. The shared band 8–8.6 pH is usable, though it does not sit centrally for both animals. |
| Hardness | Derived from stored traits | Comfortable for both. The shared band 12–22 °dGH sits centrally in both ranges, with room to drift. |
| Body size | Derived from stored traits | Frontosa reaches about 35 cm against 13 cm for Electric yellow cichlid — a ratio of 2.7. Size disparity drives opportunistic predation independently of temperament. |
| Predation | Derived from stored traits | Highest predation risk in either direction is "near-certain". |
| 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 | Derived from stored traits | Strongest intraspecific aggression across the pair is "strong". It bears on the pairing because a fish under pressure from its own kind redirects. |
| Social requirements | Derived from stored traits | Electric yellow cichlid needs at least 4; Frontosa 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 | Evidence-backed | Activity levels are compatible. Reported: A slow deliberate predator sharing a tank with a boisterous constantly-grazing mbuna is reported to feed poorly and to show it late. This is the quieter half of why the pairing is discouraged. |
| 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 800 L and 200 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: decisive. See the documented record. |
| Individual variation | Evidence-backed | Individual variation: minor. |
Environmental overlap
| Parameter | Shared range | Reading |
|---|---|---|
| Temperature | 23–26 °C | Aim for the middle of the shared band. |
| pH | 8–8.6 | Stability matters more than the exact figure. |
| Hardness | 12–22 °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 Frontosa.
- 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.
These two animals come from different kinds of water, and that is where the arithmetic below comes from rather than from anything about their temperaments.
Electric yellow cichlid
Lake Malawi
the rocky shore of Lake Malawi
200–280 µS/cm · low flow · near saturation oxygen
Frontosa
Lake Tanganyika
the deep rocky slopes of northern Lake Tanganyika
570–700 µS/cm · low flow · near saturation oxygen
- TemperatureElectric yellow cichlid 23–28°CFrontosa 23–26°C
Both inside their range from 23–26°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 7.6–8.6Frontosa 8–9
Both inside their range from 8–8.6 — 60% of the narrower animal’s range.
A real window, and a narrow one. The tank has to be held inside it, and there is little room for the drift that happens between water changes.
- General hardnessElectric yellow cichlid 10–25 dGHFrontosa 12–22 dGH
Both inside their range from 12–22 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.