Nano aquarium fish
Nano fish stay small enough for desktop tanks without feeling cramped. Every species here suits roughly a 10 gallon or smaller and stays under a few inches full grown. Profiles list adult size, minimum tank and how each fish behaves in a group.
82 species
African Butterfly Barb
Barbus hulstaerti1.4 in (3.5 cm)11 gal (40 L)63–75°F (17–24°C)Anjungan licorice gourami
Parosphromenus anjunganensis1.4 in (3.5 cm)11 gal (40 L)72–82°F (22–28°C)
Ansorge's neolebias
Neolebias ansorgii1.4 in (3.5 cm)11 gal (40 L)75–82°F (24–28°C)Asian stone catfish
Hara jerdoni1.6 in (4 cm)11 gal (40 L)64–75°F (18–24°C)
Black-barred livebearer
Quintana atrizona1.3 in (3.4 cm)11 gal (40 L)72–82°F (22–28°C)
Blue danio
Danio kerri1.8 in (4.5 cm)11 gal (40 L)68–79°F (20–26°C)
Bluefin killifish
Lucania goodei2 in (5 cm)11 gal (40 L)64–77°F (18–25°C)Brown's betta
Betta brownorum1.2 in (3 cm)11 gal (40 L)75–82°F (24–28°C)
Catalina Goby
Lythrypnus dalli2.4 in (6 cm)11 gal (40 L)59–72°F (15–22°C)
Celestial Pearl danio
Danio margaritatus0.8 in (2 cm)9 gal (35 L)72–79°F (22–26°C)
Channoides betta
Betta channoides1.6 in (4 cm)11 gal (40 L)73–82°F (23–28°C)
Chili rasbora
Boraras brigittae0.8 in (2 cm)7 gal (25 L)72–82°F (22–28°C)
Chukai Betta
Betta tussyae1.6 in (4 cm)11 gal (40 L)73–82°F (23–28°C)
Daisy's Ricefish
Oryzias woworae1.2 in (3 cm)9 gal (35 L)73–81°F (23–27°C)
Danionella cerebrum
Danionella cerebrum0.5 in (1.3 cm)8 gal (30 L)72–82°F (22–28°C)
Dracula fish
Danionella dracula0.7 in (1.7 cm)11 gal (40 L)68–79°F (20–26°C)
Dwarf livebearer
Neoheterandria elegans1 in (2.5 cm)5 gal (20 L)75–82°F (24–28°C)
Dwarf rasbora
Boraras maculatus1 in (2.5 cm)7 gal (25 L)72–82°F (22–28°C)
Dwarf seahorse
Hippocampus zosterae1.4 in (3.5 cm)5 gal (20 L)68–79°F (20–26°C)
Eggers' notho
Nothobranchius eggersi2 in (5 cm)11 gal (40 L)68–79°F (20–26°C)
Ember tetra
Hyphessobrycon amandae0.8 in (2 cm)9 gal (35 L)72–82°F (22–28°C)
Emerald betta
Betta smaragdina2.4 in (6 cm)11 gal (40 L)72–82°F (22–28°C)
Emerald dwarf rasbora
Danio erythromicron0.8 in (2 cm)11 gal (40 L)68–75°F (20–24°C)
Endler's livebearer
Poecilia wingei1.6 in (4 cm)5 gal (20 L)72–86°F (22–30°C)
Espei rasbora
Trigonostigma espei1.5 in (3.8 cm)11 gal (40 L)73–82°F (23–28°C)
Everglades pygmy sunfish
Elassoma evergladei1.3 in (3.4 cm)8 gal (30 L)54–82°F (12–28°C)
Exclamation-point rasbora
Boraras urophthalmoides0.6 in (1.6 cm)11 gal (40 L)73–81°F (23–27°C)
Eyespot rasbora
Brevibora dorsiocellata1.4 in (3.5 cm)9 gal (35 L)68–77°F (20–25°C)
Fighting gaucho
Cynopoecilus melanotaenia1.8 in (4.5 cm)5 gal (20 L)64–75°F (18–24°C)
Flame tetra
Hyphessobrycon flammeus1 in (2.5 cm)10 gal (38 L)68–79°F (20–26°C)
Foersch's notho
Nothobranchius foerschi2.2 in (5.5 cm)11 gal (40 L)72–79°F (22–26°C)Fourspotted toothcarp
Phallichthys quadripunctatus1.4 in (3.5 cm)11 gal (40 L)68–86°F (20–30°C)
Gold ocellatus shell dweller
Lamprologus ocellatus2.4 in (6 cm)11 gal (40 L)75–81°F (24–27°C)
Gold ring danio
Danio tinwini1.2 in (3 cm)11 gal (40 L)64–79°F (18–26°C)
Golden dwarf sucker
Otocinclus macrospilus1.4 in (3.5 cm)11 gal (40 L)70–79°F (21–26°C)
Golden lyretail killifish
Aphyosemion australe2.4 in (6 cm)10 gal (38 L)70–75°F (21–24°C)
Green Clown Goby
Gobiodon histrio1.8 in (4.5 cm)11 gal (40 L)72–79°F (22–26°C)Green panchax
Aplocheilus blockii2 in (5 cm)11 gal (40 L)72–82°F (22–28°C)
Gunther's nothobranch
Nothobranchius guentheri2.4 in (6 cm)11 gal (40 L)72–77°F (22–25°C)Hendra betta
Betta hendra1.8 in (4.5 cm)11 gal (40 L)73–81°F (23–27°C)Honey blue-eye
Pseudomugil mellis1.4 in (3.5 cm)11 gal (40 L)68–82°F (20–28°C)
Javanese ricefish
Oryzias javanicus1.4 in (3.5 cm)11 gal (40 L)75–84°F (24–29°C)
Jellybean tetra
Ladigesia roloffi1.2 in (3 cm)10 gal (37 L)72–81°F (22–27°C)
Kadlec's notho
Nothobranchius kadleci2.4 in (6 cm)11 gal (40 L)72–79°F (22–26°C)
Least killifish
Heterandria formosa1.4 in (3.5 cm)5 gal (20 L)68–79°F (20–26°C)
Licorice gourami
Parosphromenus deissneri1.5 in (3.8 cm)11 gal (40 L)72–82°F (22–28°C)Linke's licorice gourami
Parosphromenus linkei1.4 in (3.5 cm)11 gal (40 L)72–82°F (22–28°C)
Livid betta
Betta livida1.4 in (3.6 cm)11 gal (40 L)73–81°F (23–27°C)
Mafia killifish
Nothobranchius korthausae2 in (5 cm)10 gal (38 L)72–79°F (22–26°C)
Magnificent killifish
Hypsolebias magnificus2 in (5 cm)10 gal (38 L)72–79°F (22–26°C)
Mahachai betta
Betta mahachaiensis2.4 in (6 cm)10 gal (38 L)72–82°F (22–28°C)
Medaka
Oryzias latipes1.4 in (3.5 cm)9 gal (35 L)61–72°F (16–22°C)
Metallic livebearer
Girardinus metallicus2.4 in (6 cm)11 gal (40 L)72–81°F (22–27°C)Micro rasbora
Boraras micros0.6 in (1.5 cm)8 gal (30 L)72–79°F (22–26°C)
Neon Goby
Elacatinus oceanops2 in (5 cm)11 gal (40 L)72–79°F (22–26°C)
Neon tetra
Paracheirodon innesi1.5 in (3.8 cm)11 gal (40 L)70–77°F (21–25°C)
Ogowe killifish
Aphyosemion ogoense2 in (5 cm)11 gal (40 L)64–73°F (18–23°C)Palmqvist's notho
Nothobranchius palmqvisti2 in (5 cm)11 gal (40 L)72–81°F (22–27°C)Paska's blue-eye
Pseudomugil paskai1.4 in (3.5 cm)11 gal (40 L)72–79°F (22–26°C)
Patrizi's notho
Nothobranchius patrizii2.2 in (5.5 cm)11 gal (40 L)72–79°F (22–26°C)
Persephone betta
Betta persephone1.4 in (3.5 cm)11 gal (40 L)73–81°F (23–27°C)
Phoenix rasbora
Boraras merah0.8 in (2 cm)11 gal (40 L)72–81°F (22–27°C)Popondetta blue-eye
Pseudomugil connieae2 in (5 cm)11 gal (40 L)75–82°F (24–28°C)
Pygmy swordtail
Xiphophorus pygmaeus1.6 in (4 cm)11 gal (40 L)75–82°F (24–28°C)
Red melon dario
Dario hysginon1.2 in (3 cm)11 gal (40 L)72–79°F (22–26°C)Red neon blue-eye
Pseudomugil luminatus1.4 in (3.5 cm)11 gal (40 L)72–81°F (22–27°C)
Red-striped killifish
Aphyosemion striatum2 in (5 cm)11 gal (40 L)70–77°F (21–25°C)Redcheek betta
Betta rutilans1.4 in (3.5 cm)11 gal (40 L)73–81°F (23–27°C)
Scarlet badis
Dario dario0.8 in (2 cm)11 gal (40 L)72–79°F (22–26°C)
Scarlet betta
Betta coccina1.6 in (4 cm)11 gal (40 L)72–86°F (22–30°C)
Spotted danio
Danio nigrofasciatus1.5 in (3.7 cm)11 gal (40 L)64–79°F (18–26°C)Stiktos betta
Betta stiktos2 in (5 cm)11 gal (40 L)73–81°F (23–27°C)
Strawberry rasbora
Boraras naevus0.8 in (2 cm)11 gal (40 L)73–81°F (23–27°C)
Toba betta
Betta rubra1.6 in (4 cm)11 gal (40 L)72–81°F (22–27°C)Turquoise killifish
Nothobranchius furzeri2.4 in (6 cm)11 gal (40 L)68–79°F (20–26°C)Two-banded killifish
Chromaphyosemion bitaeniatum2.2 in (5.5 cm)10 gal (38 L)72–79°F (22–26°C)
Two-striped aphyosemion
Aphyosemion bivittatum2 in (5 cm)11 gal (40 L)72–79°F (22–26°C)Uberis betta
Betta uberis1.4 in (3.6 cm)11 gal (40 L)73–81°F (23–27°C)
Whiteseam betta
Betta albimarginata1.2 in (3 cm)11 gal (40 L)73–82°F (23–28°C)
Yellow Clown Goby
Gobiodon okinawae1.6 in (4 cm)11 gal (40 L)73–81°F (23–27°C)
Yellow Phantom Tetra
Hyphessobrycon roseus0.8 in (2 cm)7 gal (25 L)68–82°F (20–28°C)
Zebra dwarf sucker
Otocinclus cocama1.8 in (4.5 cm)11 gal (40 L)70–77°F (21–25°C)
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