Danios and rasboras
Small, fast, open-water danionins. Almost all of them measure their tank in horizontal run rather than volume, and several of the smallest want blackwater rather than the community conditions they are sold into.
34 species, separated by adult size. Part of the freshwater fish catalogue.
Nano — under 4 cm (16)
Small enough for tanks under 60 cm, and usually needing larger groups than their size suggests.
- Blue axelrodi rasboraSundadanio axelrodi2.5 cmSpecialistgroup of 10+
- Celestial pearl danioDanio margaritatus2.5 cmModerategroup of 8+
- Chili rasboraBoraras brigittae2 cmDemandinggroup of 10+
- DanionellaDanionella cerebrum1.8 cmDemandinggroup of 10+
- Dwarf microdevarioMicrodevario nana2.2 cmModerategroup of 10+
- Dwarf rasboraBoraras maculatus2.5 cmModerategroup of 10+
- Emerald dwarf rasboraDanio erythromicron2.5 cmModerategroup of 8+
- Espe's rasboraTrigonostigma espei3.5 cmUndemandinggroup of 8+
- Exclamation point rasboraBoraras urophthalmoides2 cmModerategroup of 10+
- Glowlight danioDanio choprae3.5 cmUndemandinggroup of 8+
- Gold ring danioDanio tinwini3.5 cmUndemandinggroup of 8+
- Lambchop rasboraTrigonostigma hengeli3 cmUndemandinggroup of 10+
- Merah rasboraBoraras merah2 cmModerategroup of 10+
- Neon green rasboraMicrodevario kubotai2.5 cmModerategroup of 10+
- Strawberry rasboraBoraras naevus2 cmModerategroup of 10+
- Vietnamese white cloudTanichthys micagemmae3.5 cmUndemandinggroup of 8+
Small — 4 to 8 cm (12)
The core of most community tanks.
- Blackline rasboraRasbora borapetensis5 cmUndemandinggroup of 8+
- Blue danioDanio kerri5 cmUndemandinggroup of 8+
- Eyespot rasboraBrevibora dorsiocellata4 cmModerategroup of 8+
- Glowlight rasboraTrigonopoma pauciperforatum7 cmModerategroup of 8+
- Harlequin rasboraTrigonostigma heteromorpha4.5 cmUndemandinggroup of 8+
- Orange-finned danioDanio kyathit6 cmUndemandinggroup of 8+
- Pearl danioDanio albolineatus6 cmUndemandinggroup of 6+
- Sawbwa barbSawbwa resplendens4 cmModerategroup of 8+
- Spotted danioDanio nigrofasciatus4 cmUndemandinggroup of 8+
- Truncate harlequin rasboraTrigonostigma truncata5.5 cmUndemandinggroup of 8+
- White Cloud Mountain minnowTanichthys albonubes4 cmUndemandinggroup of 8+
- Zebra danioDanio rerio5 cmUndemandinggroup of 8+
Medium — 8 to 15 cm (5)
Needs real swimming length. Frequently sold as juveniles into tanks that will not suit the adult.
Large — 15 cm and above (1)
Specialist tanks. Check the adult size and the lifespan before buying.