South America
Banded cichlid
Heros severus var.
Temp22–29°C
pH5–6.5
Size20 cm
Diet—
SwimMiddle
DifficultyModerate
Banded cichlid
Heros severus var.
fish
Soft-water fish (acidic pH range)
Species whose maximum documented pH is 6.8 or below — typical of soft, acidic setups; confirm with your own measurements.
21 species
- Asia
Black ruby barb
Pethia nigrofasciata
Temp22–26°CpH6–6.5Size6 cmDiet—SwimMiddleDifficultyModerateBlack ruby barb
Pethia nigrofasciata
- South America
Cardinal tetra
Paracheirodon axelrodi
Temp23.9–28.9°CpH4–6Size3 cmDiet—SwimMiddleDifficultyEasyCardinal tetra
Paracheirodon axelrodi
- Asia
Checkered barb
Oliotius oligolepis
Temp20–25°CpH6–6.5Size5 cmDiet—SwimMiddleDifficultyModerateCheckered barb
Oliotius oligolepis
- Asia
Chocolate gourami
Sphaerichthys osphromenoides
Temp25–30°CpH4–6Size6 cmDiet—SwimMiddleDifficultyModerateChocolate gourami
Sphaerichthys osphromenoides
- Asia
Clown rasbora
Rasbora kalochroma
Temp23–27°CpH5–6.5Size10 cmDiet—SwimMiddleDifficultyModerateClown rasbora
Rasbora kalochroma
- Asia
Coolie loach
Pangio kuhlii
Temp24–29°CpH5.5–6.5Size12 cmDiet—SwimBottomDifficultyModerateCoolie loach
Pangio kuhlii
- Asia
Dwarf rasbora
Boraras maculatus
Temp24–28°CpH5–6Size2.5 cmDiet—SwimMiddleDifficultyModerateDwarf rasbora
Boraras maculatus
- Asia
Fiveband barb
Desmopuntius pentazona
Temp23–28°CpH5–6Size8.8 cmDiet—SwimMiddleDifficultyModerateFiveband barb
Desmopuntius pentazona
- South America
Ram cichlid
Mikrogeophagus ramirezi
Temp27–30°CpH5–6Size4.2 cmDiet—SwimBottomDifficultyModerateRam cichlid
Mikrogeophagus ramirezi
- South America
Ram cichlid
Mikrogeophagus ramirezi var.
Temp26–30°CpH5–6Size4.2 cmDiet—Swim—DifficultyModerateRam cichlid
Mikrogeophagus ramirezi var.
- South America
South American freshwater stingray
Potamotrygon motoro
Temp24–28°CpH5–6Size50 cmDiet—SwimBottomDifficultyHardSouth American freshwater stingray
Potamotrygon motoro
- Asia
Spotted blue-eye
Pseudomugil gertrudae
Temp23–28°CpH6–6Size3.8 cmDiet—SwimTopDifficultyModerateSpotted blue-eye
Pseudomugil gertrudae
- South America
Threespot eartheater
Satanoperca daemon
Temp26–30°CpH5–6.5Size20.9 cmDiet—SwimBottomDifficultyModerateThreespot eartheater
Satanoperca daemon
- South America
Apistogramma mendezi
Temp24–28°CpH4–6Size6 cmDiet—SwimBottomDifficultyModerateApistogramma mendezi
- South America
Uaru fernandezyepezi
Temp27–30°CpH5–6.5Size19 cmDiet—SwimMiddleDifficultyModerateUaru fernandezyepezi
Osteoglossum ferreirae
Temp24–30°CpH5–6.5Size80 cmDiet—SwimTopDifficultyExpertOsteoglossum ferreirae
- Asia
Betta channoides
Temp24–28°CpH5–6.5Size2 cmDiet—SwimMiddleDifficultyModerateBetta channoides
- Asia
Boraras naevus
Temp24–28°CpH5–6.5Size1.3 cmDiet—SwimMiddleDifficultyEasyBoraras naevus
- Asia
Betta albimarginata
Temp24–28°CpH5–6.5Size2.8 cmDiet—SwimMiddleDifficultyModerateBetta albimarginata
- Asia
Sundadanio axelrodi
Temp23–26°CpH5–6.5Size2.3 cmDiet—SwimMiddleDifficultyModerateSundadanio axelrodi