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No federal permit to keepArgentine humphead
Gymnogeophagus balzanii
Fishes › Cichlids (Cichliformes) › Cichlidae (Cichlids)
Care follows the subtropical eartheaters guide below.
Care at a glance
Species-specific values
Values researched for this exact species. Where they differ from the group guide below, follow these. Air, surface and water temperatures are listed separately, and each source is kept as published rather than averaged.
| Water temperature | 70–77 °F (21–25 °C) Maintenance recommendations from this source; do not replace with a multisource average. | 259 |
| Water pH | 6.5–7.5 Maintenance recommendations from this source; do not replace with a multisource average. | 259 |
| Water general hardness | 5–15 dGH Maintenance recommendations from this source; do not replace with a multisource average. | 259 |
| Adult standard length | 200 mm Maximum standard length reported by source; excludes caudal fin, not total body length. | 259 |
| Minimum tank base | length: 120 cm; width: 37.5 cm Minimum aquarium base recommended by this source, not a tank-volume specification. For a pair or trio; source also gives 30 cm tank height. | 259 |
| Seasonal water temperature | 61–64 °F (16–18 °C) Seriously Fish recommends an overwintering period of 3–4 months; this is a distinct seasonal recommendation, not a year-round target. | 259 |
| Seasonal cool period | 3–4 months Same source winter recommendation; source describes the lifespan benefit as expert opinion, not a controlled experimental result. | 259 |
| Substrate | Soft sand for sifting; avoid gravel that may lodge in the gills. | 259 |
Species-specific aquarium care
- Tank: At least 24 in long and 12 in front to back for one adult (adults commonly reach about 4.7 in / 12 cm).
- Water: Freshwater.
- Temperature: 72–79°F (range recorded for this species).
- pH: 6–8.
- Hardness: 5–19 dGH.
- Layout: Uses both the bottom and open water: give open swimming space plus cover near the substrate.
Calculated from this species' own FishBase record: tank size from its typical adult length and swimming zone, water values from its recorded ranges. The group guide below fills in general care.
Care guide
Species care notes
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 70–77 °F, pH 6.5–7.5, 5–15 dGH.
- Behaviour: temperament territorial; in a pair.
- Difficulty: Moderate (Seriously Fish rating).
Short excerpts from the species profile:
- Setup: “A biotope setup would consist very simply of a sandy substrate, perhaps with some driftwood branches and twisted roots added for effect.”
- Diet: “Easily fed, provided anything offered sinks, as it will rarely feed from anywhere other than the substrate.”
- Tankmates: “Not a good community fish.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Subtropical eartheaters
Applies to most species in this group. Habitat: Subtropical Paraná/Uruguay drainage tributaries and slow creeks. [sf-gymnogeophagus-balzanii]. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- Use fine sand for substrate sifting, roots and female refuges; avoid ingestible gravel.
- Published pair/trio example: 120 × 37.5 × 30 cm, about 140 L; groups need more space. Provide effective filtration and regular large water changes.
- Seriously Fish recommends pH 6.5–7.5 and hardness 5–15 dGH.
Climate & lighting
| Water | 70–77°F |
Diet
- Small sinking prepared foods, live/frozen invertebrates and some plant matter.
Social life
- One male with multiple females; males fight. Any tankmates must tolerate the seasonal cooling.
Handling
- Minimize restraint and protect skin; use nitrile gloves if direct veterinary handling is necessary.
Health watch
- Maintain excellent water quality; this profile identifies head/lateral-line pitting concerns.
Understanding the animal
In the wild
In the wild
From this species’ own FishBase record (habitat, bottom type, water and breeding data), not its family. Good care copies these conditions.1
| Where it lives | Lives in freshwater. Uses both the bottom and open water. |
| Water it lives in | Freshwater, 72–79 °F (22–26 °C), pH 6–8, hardness 5–19 dH. |
| Climate | Subtropical climate. |
| Behavior to plan for | Breeding: external brooders. |
What this means for care
- Keep water within its wild range, 72–79 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 91°F (up to 93°F in the hottest sampled areas) |
| Cool-season lows | about 53°F (down to 45°F in the coldest sampled areas) |
| Average temperature | 66–78°F across sampled records |
| Relative humidity | 70–74% on average (driest month about 63%) |
| Rainfall | about 1340 mm a year |
Measured at 78 wild occurrence records sampled against WorldClim 2.1 climate data (1970–2000 averages). Air conditions in the range are ecological context, not enclosure settings: microhabitats such as burrows, leaf litter or basking rocks can be cooler, warmer or more humid.
From the sources
From the sources
Quoted from the matching sections of reputable sources for this exact species. Specialist databases are used first; Wikipedia (community-edited, CC BY-SA 4.0) only fills gaps. Other sources are short credited quotes.
| Where it lives | Home ranges Population dynamics Growth parameters Max. ages / sizes Length-weight rel. Length-frequencies Mass conversion Recruitment Abundance Life cycle Reproduction Maturity Maturity/Gills rel. — FishBase |
| Reproduction | Larvophile mouth brooders. This updates previous information from. — FishBase |
Data and studies
The numbers
The numbers
Each bar is what one source reports. Where several sources weigh in, the dashed gold band marks their average.
Adult length
Maximum recorded length. Measured as standard length (snout to the base of the tail, not counting the tail fin). Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
Sources for this sheet
- FishBase (Froese & Pauly, eds.), version 24.07 Peer-reviewed researchThe global scientific database on fishes, maintained by a consortium of research institutions; every value is referenced.
- Seriously Fish species profiles Experienced keeper or breederLong-running aquarium reference written and peer-checked by experienced fishkeepers and ichthyologists; each profile covers habitat, tank size, water, diet, behaviour and breeding.
- Seriously Fish: Gymnogeophagus balzanii Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Merck Veterinary Manual: Management of aquarium fish Zoo, university or veterinaryThe Merck Veterinary Manual: a standard veterinary reference written and reviewed by veterinary specialists.
- FishBase: Gymnogeophagus balzanii species summary Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
- iNaturalist (captive observations) Community referenceCommunity observation platform run by the California Academy of Sciences and National Geographic; observations marked captive show animals living in homes, zoos and aquariums.
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