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.
Uruguayan Eartheater At a Glance
Uruguayan Eartheater Tank Requirements
Will Uruguayan Eartheater fit in your tank?
Care guides tell you what Uruguayan Eartheater needs, the next question is whether your tank can safely provide it. Test Uruguayan Eartheater against your tank size, maintenance needs, and the fish you already keep before you buy.
Uruguayan Eartheater Water Parameters
Uruguayan Eartheater Temperament & Compatibility
Uruguayan Eartheater Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Unsexed
Typical commercial availability. Usually sold as juveniles. Best kept in a group of 5+ to allow natural pair formation.
Differs in 1 trait from base species
Also known as: Juvenile
Male
Males are larger, display more intense iridescent blue/green coloration, and develop a prominent nuchal hump (head hump) as they mature. Highly territorial toward other males.
Differs in 3 traits from base species
Also known as: Adult Male, Bull
Female
Smaller and less colorful than males, lacking the prominent head hump. They are substrate spawners and fiercely defend their fry. Multiple females can be kept with a single male.
Differs in 2 traits from base species
Also known as: Adult Female
Uruguayan Eartheater Care Guide Summary
The Uruguayan Eartheater, scientifically known as Gymnogeophagus australis, belongs to the Cichlids - South American family group. Adults reach a maximum size of approximately 14 cm and have a compressed body shape with a moderate growth rate. Classified as semi-aggressive, this species primarily occupies the bottom and mid-level zones of the aquarium and produces a high level of biological waste.
To thrive, the Uruguayan Eartheater requires a freshwater only aquarium with a minimum volume of 200 litres and a tank length of at least 120 cm. Water temperature should be maintained between 15°C and 25°C, with a pH range of 6–7.5 and a general hardness of 4–15 dGH. A moderate water flow is preferred.
The Uruguayan Eartheater is a rewarding species to keep, provided its core environmental needs are met. This species is available in 3 varieties: Standard / Unsexed, 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.
Uruguayan Eartheater Habitat Setup
When setting up an aquarium for the Uruguayan Eartheater, a moderate water flow best suits their natural preferences. Because this species occupies the bottom and mid-level 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 and smooth gravel or rounded substrate to protect their sensitive barbels. Keepers should note that expect substrate disturbance, so lightweight décor should be secured.
Uruguayan Eartheater Compatibility Notes
Classified as semi-aggressive, the Uruguayan Eartheater is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the bottom and mid-level zones can help reduce competition and territorial overlap.
Who Uruguayan Eartheater Is Actually For
Uruguayan Eartheater 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 Uruguayan Eartheater 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.
Uruguayan Eartheater Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Uruguayan Eartheater.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Frequently Asked Questions About Uruguayan Eartheater
How big does Uruguayan Eartheater get?
Uruguayan Eartheater (Gymnogeophagus australis) typically reaches a maximum adult size of approximately 14 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Uruguayan Eartheater need?
A minimum aquarium volume of 200 litres and a tank length of at least 120 cm are recommended for Uruguayan Eartheater. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Uruguayan Eartheater need?
Uruguayan Eartheater thrives in freshwater only conditions with a temperature range of 15–25°C, a pH between 6 and 7.5, and a general hardness of 4–15 dGH. A moderate water flow is preferred.
Is Uruguayan Eartheater peaceful or aggressive?
Uruguayan Eartheater 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 Uruguayan Eartheater live alone?
Yes, Uruguayan Eartheater can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Uruguayan Eartheater have any special tank requirements?
Yes. Uruguayan Eartheater benefits from sand (sifters) and smooth gravel (sensitive barbels) 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 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
Plants That Suit Uruguayan Eartheater
These plants pair well with Uruguayan Eartheater 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 Uruguayan Eartheater
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.
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.
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.
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.
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.
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.