Gymnogeophagus meridionalis
Gymnogeophagus meridionalis
A stunning subtropical 'eartheater' cichlid native to the Uruguay River basin. Unlike typical Amazonian cichlids, they are temperate and benefit from a seasonal winter cooling period. As their name implies, they continuously sift the substrate for benthic invertebrates, making a soft sand substrate an absolute necessity to prevent mouth and gill damage. While generally peaceful for a cichlid, they become fiercely territorial during breeding.
Gymnogeophagus meridionalis At a Glance
Gymnogeophagus meridionalis Tank Requirements
Will Gymnogeophagus meridionalis fit in your tank?
Care guides tell you what Gymnogeophagus meridionalis needs, the next question is whether your tank can safely provide it. Test Gymnogeophagus meridionalis against your tank size, maintenance needs, and the fish you already keep before you buy.
Gymnogeophagus meridionalis Water Parameters
Gymnogeophagus meridionalis Temperament & Compatibility
Gymnogeophagus meridionalis Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male
Males are significantly larger, display vibrant red fins with blue/green spangling, and develop a prominent nuchal hump on their forehead (especially when kept outdoors or during breeding season). They are highly intolerant of rival males.
Differs in 3 traits from base species
Also known as: Dominant Male, Bull
Female
Females are smaller, lack the prominent nuchal hump, and have slightly more subdued coloration. They are generally more peaceful except when defending fry or eggs.
Differs in 2 traits from base species
Also known as: Female
Gymnogeophagus meridionalis Care Guide Summary
The Gymnogeophagus meridionalis, scientifically known as Gymnogeophagus meridionalis, belongs to the Cichlids - South American family group. Adults reach a maximum size of approximately 10 cm and have a compressed body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a high level of biological waste.
To thrive, the Gymnogeophagus meridionalis requires a freshwater only aquarium with a minimum volume of 115 litres and a tank length of at least 90 cm. Water temperature should be maintained between 15°C and 26°C, with a pH range of 6.5–8 and a general hardness of 5–15 dGH. A moderate water flow is preferred.
The Gymnogeophagus meridionalis is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Male and Female. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Gymnogeophagus meridionalis Habitat Setup
When setting up an aquarium for the Gymnogeophagus meridionalis, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour. Keepers should note that expect substrate disturbance, so lightweight décor should be secured.
Gymnogeophagus meridionalis Compatibility Notes
Classified as semi-aggressive, the Gymnogeophagus meridionalis is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, conspecific aggression can be intense, especially in smaller tanks and territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Who Gymnogeophagus meridionalis Is Actually For
Gymnogeophagus meridionalis is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.
The most common mistake is treating Gymnogeophagus meridionalis like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.
Gymnogeophagus meridionalis Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Gymnogeophagus meridionalis.
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
Show 9 more tank sizes
Frequently Asked Questions About Gymnogeophagus meridionalis
How big does Gymnogeophagus meridionalis get?
Gymnogeophagus meridionalis (Gymnogeophagus meridionalis) typically reaches a maximum adult size of approximately 10 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Gymnogeophagus meridionalis need?
A minimum aquarium volume of 115 litres and a tank length of at least 90 cm are recommended for Gymnogeophagus meridionalis. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Gymnogeophagus meridionalis need?
Gymnogeophagus meridionalis thrives in freshwater only conditions with a temperature range of 15–26°C, a pH between 6.5 and 8, and a general hardness of 5–15 dGH. A moderate water flow is preferred.
Is Gymnogeophagus meridionalis peaceful or aggressive?
Gymnogeophagus meridionalis is classified as semi-aggressive with an aggression score of 5 out of 10. They can work in community setups but may clash with certain tankmates.
Can Gymnogeophagus meridionalis live alone?
Yes, Gymnogeophagus meridionalis can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Gymnogeophagus meridionalis have any special tank requirements?
Yes. Gymnogeophagus meridionalis benefits from sand (sifters) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 6, 2026
- Last updated
- May 6, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Gymnogeophagus meridionalis
These plants pair well with Gymnogeophagus meridionalis based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Anubias Barteri
Anubias barteri
Belinda's Buce
Bucephalandra belindae
Buce Motleyana
Bucephalandra motleyana
Christmas Moss
Vesicularia montagnei
Congo Anubias
Anubias heterophylla
Fish Similar to Gymnogeophagus meridionalis
Uruguayan Eartheater
Gymnogeophagus australis
A beautiful, subtropical eartheating cichlid from the Uruguay River basin. They constantly sift sand for food and are generally peaceful but territorial during breeding. Crucially, they require a cool 'winter' period (15-20°C) to thrive long-term; keeping them at year-round tropical temperatures will drastically shorten their lifespan and cause them to lose color.
Stripefin Eartheater
Gymnogeophagus rhabdotus
A beautifully spangled subtropical eartheater native to Uruguay and southern Brazil. Unlike tropical South American cichlids, they thrive in cooler water and optimally require a winter 'cool down' period (below 20°C) to simulate their natural seasonal cycle, promoting long-term health and breeding. As eartheaters, they constantly sift the substrate for food, meaning soft sand is an absolute requirement to prevent gill damage.
Cupid Cichlid
Biotodoma cupido
A peaceful, mildly gregarious 'eartheater' cichlid native to the Amazon and Essequibo River basins. Known for the distinctive black teardrop marking behind their gills and subtle, iridescent pastel coloration. Unlike many South American cichlids, they are remarkably gentle and thrive in small shoals. They require excellent water quality and a soft sand substrate to exhibit their natural sifting behavior.
Red Striped Eartheater
Geophagus surinamensis
A large, relatively peaceful South American cichlid famous for its 'earth-eating' behavior. They constantly sift fine sand through their gills to forage for benthic invertebrates. A soft sand substrate is absolutely mandatory for their long-term health to prevent gill damage and stress. While gregarious and best kept in groups, they establish a strict pecking order.
Jurupari Eartheater
Satanoperca jurupari
The Jurupari Eartheater is a remarkably peaceful South American cichlid famous for its continuous substrate-sifting behavior. They require a fine sand substrate to thrive and prevent damage to their delicate gills. Unlike highly aggressive cichlids, they are gentle giants that prefer the company of their own kind in a large, uncrowded community of similar-sized peaceful fish.
Pearl Eartheater
Geophagus brasiliensis
A robust, highly adaptable South American cichlid known for its iridescent pearl-like spangling. While classified as an 'eartheater' (sifting sand for food), they are less obligate sifters than other Geophagus species but still require a soft sand substrate. They are surprisingly tolerant of cooler water and even brackish conditions. They are aggressive for eartheaters, especially when breeding.