Redhead Cichlid
Vieja melanura
Imposing vegetarian monster (35 cm). Stunning for its fluo colors (red/pink face, yellow base). Turbulent and intolerant species that uproots every plant and requires huge and resistant tanks.
Water Temperature
24 - 28 °C
pH Value
7 - 8
Water type
Freshwater
Tank level
Middle
Adult size
35 cm
Minimum tank volume
>= 300 L
Minimum group
>= 1
GH
10 - 20 dGH
KH
5 - 10 dKH
TDS
200 - 400 ppm
Conductivity
313 - 625 uS/cm
Species description
Geographical Origin and Habitat: Mastodontic inhabitant of the Usumacinta river system, distributed along crater volcanic lakes, muddy-bottomed lagoons and turbid rivers between Guatemala, Mexico and Belize.
Taxonomy and Morphology: Formerly Cichlasoma synspilum. It is a colossus: highly ovalized but immensely massive body (thick and very wide). A mature dominant male serenely touches 35 cm (14 inches) in height and length, with the truncated face embellished (or made ugly) by a monstrous nuchal adipose excrescence (gibbosity or 'kok'). Strong teeth formed for chewing.
Social Behavior: Titanic and warmongering personality. When young it lives in mild small groups but, as an adult (especially if the pair is formed), it does not tolerate competitors, unleashing an absolute territorial ferocity aimed at killing rivals in a closed tank. It is the typical 'tank-buster' that redesigns every stone and furnishing by shattering or biting to death hindering branches or plastics.
Coloration and Sexual Dimorphism: Breathtaking: the most psychedelic palette in continental freshwater fish. The anterior part of the body and the face take on incredible splashes and masks of plum color, bright crimson or pure scarlet ('Redhead'). The side fades into huge fluorescent gold, jade or intense light blue scales and pink belly. From the eye to the tail, a thick broken black bar. Colossal and bumpy male; grayer-purplish and smaller females (25 cm / 10 inches).
Care, breeding and tankmates
Aquarium Setup: Demands military respect and zero delicacy. Only monumental tanks in length (from 200 cm / 80 inches or a thousand liters / 250 Gal and up). Bare 'Monster-fish' tank: thick gravel (sand clogs the filter from how much they move), huge single pebbles too heavy for their mouth and huge blocked smooth trunks. NO plant survives, they consider it an expensive salad (not even the Anubias resists the jaws). Silicone the filters well or they will break the pipes by biting.
Diet and Feeding: A HERBIVOROUS colossus. Here the error is lethal: although they eat shrimp and snails in nature, if in the aquarium you offer a meat diet (fish, bloodworms or animal pellets), they will contract fatal intestinal blocks and hepato-toxic lethargy in weeks. Provide large massive plant-based pellets (Spirulina), weekly shovelfuls of blanched whole fresh lettuce, huge peas and slices of zucchini and apple floating sinking.
Water Quality: Strongly calcareous Mexican water (stably neutral/alkaline pH between 7.0 and 8.0), thick calcareous indices (GH 10-20). Torrid temperatures 24-28°C (75-82°F). Given the monstrous production of very heavy polluting bioload due to the plant diet, a titanic industrial dual-filter system and well drains in the tank for copious changes are vital to avoid a lightning peak of ammonia.
Compatibility and Cohabitation: Solitary tank model (for the pair). To dare in community, 1500 Lt (400 Gal) pool aquariums are required, assembling it solely with other monsters of equivalent caliber and hard shell (titanic Pterygoplichthys, pissed off oscars, Jaguar cichlids, large Botia or gigantic silver characins) always on the alert to avoid summer slaughters in reproduction.
Aquarium Breeding: Both dress in blackish liveries terrorizing the tank for months in a hunt taking no prisoners and depositing on flat slabs up to more than a thousand huge amber adhesive eggs. Very numerous fry similar to insatiable grasshoppers eat-everything, rearable by both and defended to the last bite by the father.
Risks and Diseases: If mistakenly fed with carnivorous/mammalian protein, lethal fulminating purulent Hexamitiasis arises in the head in a few days (one cm deep cranial holes) or dropsy in case the water change decays. They tend to break thin glass of heaters causing themselves burns.
Geographic Origin and Distribution
Mastodontic inhabitant of the Usumacinta river system, distributed along crater volcanic lakes, muddy-bottomed lagoons and turbid rivers between Guatemala, Mexico and Belize.
Origin
Central America and CaribbeanNorth America
Fish profile
- Temperament
- Semi-aggressive
- Their temperament is boisterous, dominant, and inherently aggressive. They are full of personality and often learn to interact with their owners, begging for food. While they are highly rewarding to keep, their territorial nature means they are not to be underestimated. Careful planning is required to balance their aggression in a community setting.
- Diet
- Omnivore
- This species is primarily omnivorous with a strong leaning toward herbivory in the wild. In the aquarium, it enthusiastically consumes high-quality cichlid pellets, fresh vegetables, spirulina, and occasional meaty treats like krill or earthworms. Providing a varied diet rich in plant matter is important to prevent digestive issues like bloat. They are voracious eaters that rarely refuse a meal.
- Life expectancy
- 10-15 years
- Under optimal care in a large, clean environment, the Redhead Cichlid can easily live for 10 to 15 years in captivity. Achieving this impressive lifespan requires a robust water filtration system and a highly specialized, plant-based diet to prevent internal organ failure. Consistent water quality and avoiding chronic stress from crowded conditions are also essential factors in their long-term health. Regular water testing and large water changes will keep them thriving.
- Adult size
- 35 cm
- The catalog's scalar value is 35 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 35 cm for this species, recorded as total length (TL). The taxonomic link follows a synonym to the FishBase SPECIES table (v25.04 snapshot) record for Vieja melanurus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Solitary
- When keeping them, forming a compatible male-female pair is the most common goal for breeding. Keeping multiple males in the same tank usually leads to severe aggression unless the aquarium is exceptionally massive. If not breeding, keeping a single specimen as a wet pet is a very popular and rewarding choice. Females tend to be slightly smaller and less colorful than dominant males.
- Feeding frequency
- Twice daily
- Adults should be fed once or twice a day with portions they can completely consume within a few minutes. Overfeeding must be avoided as it exacerbates water quality issues in an already heavily loaded system. Juveniles can be fed smaller amounts three times a day to support rapid growth. Fasting them for one day a week can aid digestion and mimic natural feeding inconsistencies.
- Bioload
- This large cichlid generates a very high bioload due to its substantial size and messy eating habits. Massive biological and mechanical filtration systems are mandatory to process the large amounts of waste produced. Heavy water changes on a weekly basis are crucial to keep nitrates in check. Aquarists must be prepared for the stringent maintenance demands of housing such a bulky species.
- Flow
- Stagnant
- They originate from lakes and slow to moderate-moving rivers, so they appreciate a decent amount of current. Good flow helps keep waste suspended for the filters to catch, which is essential given their messy habits. However, there should also be calmer areas in the tank where they can rest without fighting the current. Powerheads can be used to create an appropriate dynamic flow environment.
- Reproduction
- Oviparous
- They are substrate spawners that exhibit strong biparental care. A pair will clean a flat rock or pit in the gravel to lay hundreds of eggs. During this time, they become hyper-aggressive, attacking any fish that approaches their territory. The parents will diligently guard the fry for weeks, moving them around in pits until they are free-swimming.
- Compatibility & tankmates
- It can be highly aggressive and fiercely territorial, especially during breeding. It is completely unsuitable for community tanks with small or delicate fish, which will be bullied or eaten. Tank mates must be similarly sized, robust cichlids or large dither fish that can hold their own. Even in very large aquariums, aggression must be monitored closely to prevent fatalities.
- Tank level
- Middle
- These bulky cichlids will actively utilize the middle and lower levels of the aquarium. They spend a lot of time sifting through the substrate or rearranging decor to their liking. Plants are typically uprooted or eaten, so aquascaping must consist of heavy rocks and sturdy driftwood. They constantly patrol their established territory across the bottom half of the tank.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 2.6 ± 0.28 se
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5039
- Bayesian Length-Weight
- a = 0.02089, b = 2.97
- VulnerabilityLow vulnerability (25 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
