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Gymnogenys Eartheater

Gymnogeophagus gymnogenys

Freshwater South America

A delayed mouthbrooding eartheater from the southern reaches of South America, with males growing prominent nuchal humps. It continuously sifts soft sand for food and must experience an unheated winter cooling period to preserve long-term vitality.

Also called: Dark mother-of-pearl fish, Earth eater, Smooth-cheek eartheater.

14 cm adult length, drawn to scale. deep body.

Try it in the planner Opens a tank sized to its minimum with 1 fish added.

What it needs

ItemValueBecause
Adult length 14 cm Used for the Space check: the tank must be long enough for the fish to turn round.
Smallest tank 250 L, at least 120 cm long estimated The least water and floor length this species is kept in for good, as a single fish or smallest group.
Extra water per added fish 35 L estimated What each further fish adds once the minimum is met.
Waste load Class 3 of 5 estimated How much waste an adult makes against its size. Feeds the Load check.
Temperature 16 to 25 C Stock sharing a tank need overlapping ranges.
pH 6.5 to 7.5 Compared with tankmates in the Water check.
Hardness GH 5 to 15, KH 2 to 8 Degrees of general and carbonate hardness.
Flow Low Low-flow fish are stressed in a strong current.
Light Moderate Matched to the lighting class on the needs sheet.
Group size Single fish is fine Not a schooling species.
Temperament Peaceful Territorial: weak.
Swims in Near the bottom Fish that use different levels share a tank more easily.
Lifespan About 9 years A fish is a long commitment.
Experience Some experience helps A guide to how forgiving the species is of mistakes.

Tags marked estimated are judged from the size and habits of the species rather than measured, so treat them as a sensible default.

Diet and tank layout

Gymnogenys Eartheater is an omnivore that swims in the lowest part of the tank. It leaves most plants alone. Give it some cover. It digs, so anchor plants and keep hard rock off loose sand.

Tankmates

Works with

Depends

Avoid

Compare any two fish on the compatibility page, or print the equipment for a stock on the needs sheet. How this is worked out: the method.