Overview
The Freshwater Flounder (Achirus spp.) is a advanced freshwater species known for its brown-tan (camouflage) coloration. True flatfish. Bottom.
Origin & Appearance
Origin: Central/South America.
Colors: Brown-Tan (camouflage).
Body Shape: Depressiform Wide (flat disc). Typical adult dimensions: 15.0 x 9.8 x 1.2.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 30 gallons |
| Temperature | 72–82°F |
| pH Range | 6.5–7.5 |
| Water Hardness (GH) | 5-15 |
| Bioload | medium |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Bottom |
Behavior & Activity
Bottom crawler; flat body lies on substrate perfectly camouflaged; shuffles slowly across sand; ambush strikes
Speed: 20/100Aggression: 4/10nocturnal
Breeding
Not bred at home
Common Diseases
💊 Ich
Expert Notes
True flatfish; rare in aquaria