Asia
Chocolate gourami
Sphaerichthys osphromenoides
Temp26–31°C
pH4–6.5
Size5 cm
DietCarnivore
SwimMiddle
DifficultyModerate
Adult tank54 L
Recommended group6
Chocolate gourami
Sphaerichthys osphromenoides
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.
12 species
- Peninsular Malaysia, Sumatra, Borneo
Coolie loach
Pangio semicincta
Temp21–26°CpH5.5–6.5Size10 cmDietOmnivoreSwimBottomDifficultyEasyAdult tank54 LRecommended group5Coolie loach
Pangio semicincta
- Asia
Dwarf rasbora
Boraras maculatus
Temp20–28°CpH5–6.5Size2.5 cmDietOmnivoreSwimMiddleDifficultyModerateAdult tank40 LRecommended group10Dwarf rasbora
Boraras maculatus
- Western Ghats of southern India (Goa, Karnataka, Kerala, Tamil Nadu)
Melon Barb
Haludaria fasciata
Temp22–26°CpH6–6.5Size6 cmDietOmnivoreSwimMiddleDifficultyModerateAdult tank—Recommended group—Melon Barb
Haludaria fasciata
- South America
Mendezs Dwarf Cichlid
Apistogramma mendezi
Temp23–29°CpH4–6Size6 cmDietCarnivoreSwimBottomDifficultyModerateAdult tank80 LRecommended group2Mendezs Dwarf Cichlid
Apistogramma mendezi
- Asia
Neon Blue Rasbora
Sundadanio axelrodi
Temp23–26°CpH4–6.5Size2.5 cmDietOmnivoreSwimMiddleDifficultyHardAdult tank30 LRecommended group8Neon Blue Rasbora
Sundadanio axelrodi
- South America
Panda Uaru
Uaru fernandezyepezi
Temp27–30°CpH5–6.5Size19 cmDietOmnivoreSwimMiddleDifficultyModerateAdult tank350 LRecommended group2Panda Uaru
Uaru fernandezyepezi
- South America
Pictus cat
Pimelodus pictus
Temp22–25°CpH5.8–6.8Size12 cmDietOmnivoreSwimBottomDifficultyModerateAdult tank243 LRecommended group6Pictus cat
Pimelodus pictus
- Asia
Snakehead Betta
Betta channoides
Temp23–30°CpH4–6.5Size4 cmDietCarnivoreSwimMiddleDifficultyModerateAdult tank41 LRecommended group1Snakehead Betta
Betta channoides
- South America
South American freshwater stingray
Potamotrygon motoro
Temp24–28°CpH5–6Size50 cmDietCarnivoreSwimBottomDifficultyHardAdult tank1000 LRecommended group1South American freshwater stingray
Potamotrygon motoro
- South America
Threespot eartheater
Satanoperca daemon
Temp24–28°CpH3.5–6Size25 cmDietOmnivoreSwimBottomDifficultyModerateAdult tank756 LRecommended group5Threespot eartheater
Satanoperca daemon
- Asia
White Seam Betta
Betta albimarginata
Temp23–28°CpH4–6.5Size3 cmDietInsectivoreSwimMiddleDifficultyModerateAdult tank41 LRecommended group1White Seam Betta
Betta albimarginata