TankScore

Species Ledger

Every fact behind the grade, with its sources

144 freshwater species. Each row was checked against at least two public care sources on the date shown. Where sources disagreed, we used the more cautious figure.

SpeciesAdult sizeMin tankTemppHTemperamentGroupSourcesConfidenceChecked
African butterflyfish
Pantodon buchholzi		 12 cm40 gal24–28 °C6.5–7 semi-aggressive— 1 2 3 high2026-11-09
African dwarf frog
Hymenochirus boettgeri		 4 cm10 gal24–26 °C6.6–7.4 peaceful— 1 2 3 medium2026-11-09
Agassiz's dwarf cichlid
Apistogramma agassizii		 7.5 cm20 gal26–29 °C5–7 semi-aggressive— 1 2 3 medium2026-11-09
Amano shrimp
Caridina multidentata		 5 cm10 gal21–27 °C6–7 peaceful— 1 2 high2026-11-09
Angelfish
Pterophyllum scalare		 15 cm40 gal24–28 °C6–7.4 semi-aggressive— 1 2 3 4 high2026-11-09
Assassin snail
Anentome helena (Clea helena)		 3 cm10 gal24–27 °C7–8 peaceful— 1 2 3 high2026-11-09
Bala shark
Balantiocheilos melanopterus		 35 cm230 gal22–28 °C6–8 peaceful5+ 1 2 3 4 high2026-11-09
Banded archerfish
Toxotes jaculatrix		 30 cm115 gal25–30 °C7–8 semi-aggressive5+ 1 2 high2026-11-09
Banjo catfish
Bunocephalus coracoideus		 15 cm25 gal25–27 °C6–7.8 peaceful— 1 2 3 high2026-11-09
Betta (male)
Betta splendens		 7 cm10 gal24–30 °C6–8 semi-aggressive— 1 2 3 4 high2026-11-09
Black ghost knifefish
Apteronotus albifrons		 50 cm170 gal23–28 °C6–8 semi-aggressive— 1 2 3 4 high2026-11-09
Black neon tetra
Hyphessobrycon herbertaxelrodi		 3.5 cm20 gal23–27 °C5.5–7 peaceful8+ 1 2 3 high2026-11-09
Black phantom tetra
Hyphessobrycon megalopterus		 3.6 cm20 gal22–28 °C6–7 peaceful8+ 1 2 3 high2026-11-09
Black ruby barb
Pethia nigrofasciata		 6 cm20 gal22–26 °C5.5–7.5 peaceful6+ 1 2 medium2026-11-09
Black skirt tetra
Gymnocorymbus ternetzi		 7.5 cm20 gal22–26 °C6–7 semi-aggressive12+ 1 2 3 medium2026-11-09
Bleeding heart tetra
Hyphessobrycon erythrostigma		 6 cm30 gal23–26 °C5.6–7.2 peaceful8+ 1 2 3 medium2026-11-09
Bloodfin tetra
Aphyocharax anisitsi		 5.5 cm30 gal18–28 °C6–8 peaceful6+ 1 2 3 medium2026-11-09
Blue acara
Andinoacara pulcher		 16 cm30 gal22–28 °C6.5–8 semi-aggressive— 1 2 3 medium2026-11-09
Boeseman's rainbowfish
Melanotaenia boesemani		 11 cm40 gal27–30 °C7–8 peaceful6+ 1 2 medium2026-11-09
Bolivian ram
Mikrogeophagus altispinosus		 8 cm50 gal24–26 °C6–7.4 peaceful— 1 2 3 4 high2026-11-09
Bristlenose pleco
Ancistrus sp. (cf. cirrhosus, 'common bristlenose')		 12.5 cm30 gal23–25 °C6.5–7.5 peaceful— 1 2 3 4 high2026-11-09
Bronze corydoras
Corydoras aeneus (now Osteogaster aenea)		 7.5 cm20 gal21–25 °C6–7 peaceful6+ 1 2 3 high2026-11-09
Buenos Aires tetra
Psalidodon anisitsi		 7.5 cm30 gal16–28 °C5.5–8.5 semi-aggressive8+ 1 2 3 medium2026-11-09
Bumblebee goby
Brachygobius doriae / B. xanthozonus (trade)		 3.5 cm10 gal22–28 °C7–8.5 semi-aggressive6+ 1 2 3 high2026-11-09
Cardinal tetra
Paracheirodon axelrodi		 3.5 cm20 gal23–27 °C4.6–6 peaceful8+ 1 2 3 medium2026-11-09
Celestial pearl danio
Danio margaritatus		 2.1 cm10 gal20–26 °C6.5–7.5 peaceful8+ 1 2 3 high2026-11-09
Checkerboard barb
Oliotius oligolepis		 5 cm20 gal20–24 °C5.5–7.5 peaceful6+ 1 2 medium2026-11-09
Cherry barb
Puntius titteya		 5 cm25 gal23–27 °C6–7 peaceful6+ 1 2 3 high2026-11-09
Cherry shrimp
Neocaridina davidi		 3 cm5 gal18–28 °C6.5–8 peaceful10+ 1 2 high2026-11-09
Chili rasbora
Boraras brigittae		 2 cm10 gal25–28 °C4–7 peaceful8+ 1 2 3 high2026-11-09
Chinese algae eater
Gyrinocheilus aymonieri		 28 cm80 gal22–26 °C6.8–7.4 semi-aggressive— 1 2 3 high2026-11-09
Clown killifish
Epiplatys annulatus		 4 cm10 gal20–26 °C4–7 peaceful8+ 1 2 3 medium2026-11-09
Clown loach
Chromobotia macracanthus		 30 cm170 gal25–30 °C6–7 peaceful6+ 1 2 3 4 high2026-11-09
Clown pleco
Panaqolus maccus		 10 cm29 gal23–27 °C6.5–7.8 peaceful— 1 2 3 medium2026-11-09
Cockatoo dwarf cichlid
Apistogramma cacatuoides		 8 cm20 gal24–27 °C5–6 semi-aggressive— 1 2 3 4 high2026-11-09
Colombian tetra
Hyphessobrycon columbianus		 6.5 cm30 gal20–28 °C5–7.5 peaceful8+ 1 2 low2026-11-09
Common / comet goldfish
Carassius auratus (single-tail forms)		 30 cm50 gal10–21 °C6–8 peaceful— 1 2 3 4 medium2026-11-09
Common pleco
Pterygoplichthys pardalis (trade 'common pleco'; also P. disjunctivus, Hypostomus spp.)		 45 cm145 gal23–27 °C7–7.5 peaceful— 1 2 3 medium2026-11-09
Congo tetra
Phenacogrammus interruptus		 8 cm40 gal23–26 °C6–7.5 peaceful6+ 1 2 3 high2026-11-09
Convict cichlid
Amatitlania nigrofasciata		 15 cm40 gal26–28 °C7–8 aggressive— 1 2 3 high2026-11-09
CPO dwarf crayfish
Cambarellus patzcuarensis 'Orange'		 5 cm10 gal19–24 °C6.5–8 peaceful— 1 2 high2026-11-09
Crystal red shrimp
Caridina cantonensis var. 'Crystal Red' (C. logemanni group)		 3 cm10 gal22–24 °C6–6.7 peaceful10+ 1 2 medium2026-11-09
Demasoni cichlid
Chindongo demasoni (syn. Pseudotropheus demasoni)		 8 cm65 gal24–26 °C7.6–8.5 aggressive— 1 2 3 medium2026-11-09
Denison barb
Sahyadria denisonii		 15 cm75 gal16–25 °C6.8–7.8 peaceful6+ 1 2 3 high2026-11-09
Diamond tetra
Moenkhausia pittieri		 6 cm20 gal24–27 °C6–7 peaceful6+ 1 2 3 medium2026-11-09
Discus
Symphysodon aequifasciatus / S. spp. (domestic strains)		 15 cm60 gal28–30 °C5–7 peaceful6+ 1 2 3 4 high2026-11-09
Dojo loach
Misgurnus anguillicaudatus		 28 cm65 gal18–23 °C6.5–8 peaceful3+ 1 2 3 high2026-11-09
Dwarf gourami
Trichogaster lalius		 8.8 cm20 gal24–27 °C6–7.5 semi-aggressive— 1 2 3 4 medium2026-11-09
Dwarf neon rainbowfish
Melanotaenia praecox		 6 cm20 gal23–28 °C6.8–7.5 peaceful6+ 1 2 medium2026-11-09
Dwarf pencilfish
Nannostomus marginatus		 3.5 cm10 gal22–28 °C5.8–7 peaceful10+ 1 2 medium2026-11-09
Electric yellow lab
Labidochromis caeruleus		 10 cm50 gal24–26 °C7.7–8.6 semi-aggressive— 1 2 3 4 high2026-11-09
Ember tetra
Hyphessobrycon amandae		 2 cm10 gal24–27 °C5.5–7 peaceful8+ 1 2 3 4 high2026-11-09
Emerald dwarf rasbora
Danio erythromicron		 2.5 cm15 gal21–24 °C7–8 peaceful8+ 1 2 medium2026-11-09
Emperor tetra
Nematobrycon palmeri		 4.2 cm30 gal23–27 °C5.5–7.5 peaceful6+ 1 2 3 medium2026-11-09
Endler's livebearer
Poecilia wingei		 2.5 cm10 gal24–30 °C7–8.5 peaceful3+ 1 2 3 medium2026-11-09
Fancy goldfish
Carassius auratus (twin-tail fancy forms)		 15 cm20 gal10–21 °C6–8 peaceful— 1 2 3 high2026-11-09
Firemouth cichlid
Thorichthys meeki		 15 cm30 gal26–28 °C6.5–7.5 semi-aggressive— 1 2 3 high2026-11-09
Flying fox
Epalzeorhynchos kalopterum		 16 cm65 gal24–26 °C6.5–7 semi-aggressive— 1 2 high2026-11-09
Forktail blue-eye
Pseudomugil furcatus		 6 cm15 gal24–28 °C7–8 peaceful8+ 1 2 medium2026-11-09
Gardneri killifish
Fundulopanchax gardneri		 6.5 cm10 gal22–25 °C6–7.2 semi-aggressive2+ 1 2 3 4 medium2026-11-09
German blue ram
Mikrogeophagus ramirezi		 5 cm20 gal27–30 °C5–6 peaceful2+ 1 2 3 4 high2026-11-09
Ghost shrimp
Palaemonetes paludosus		 4 cm10 gal18–27 °C7–8 peaceful— 1 2 3 medium2026-11-09
Giant danio
Devario aequipinnatus		 10 cm75 gal16–26 °C6–8 semi-aggressive8+ 1 2 3 medium2026-11-09
Glass catfish
Kryptopterus vitreolus		 6.5 cm30 gal24–26 °C6.5–7 peaceful6+ 1 2 3 high2026-11-09
Glowlight tetra
Hemigrammus erythrozonus		 4 cm20 gal24–27 °C6–7.5 peaceful6+ 1 2 3 high2026-11-09
Gold barb
Barbodes semifasciolatus		 7.5 cm30 gal18–23 °C6–8 peaceful8+ 1 2 3 high2026-11-09
Golden pencilfish
Nannostomus beckfordi		 6.5 cm10 gal21–27 °C6–8 peaceful10+ 1 2 medium2026-11-09
Green neon tetra
Paracheirodon simulans		 2.5 cm10 gal24–27 °C5–6.5 peaceful8+ 1 2 3 medium2026-11-09
Guppy
Poecilia reticulata		 6 cm10 gal18–28 °C7–8 peaceful3+ 1 2 high2026-11-09
Habrosus corydoras
Corydoras habrosus (now Hoplisoma habrosum)		 3.5 cm15 gal21–26 °C6–7.5 peaceful8+ 1 2 3 high2026-11-09
Harlequin rasbora
Trigonostigma heteromorpha		 4.5 cm15 gal22–25 °C6–7 peaceful8+ 1 2 3 high2026-11-09
Head-and-tail-light tetra
Hemigrammus ocellifer		 4.5 cm20 gal24–28 °C6–7.5 peaceful6+ 1 2 medium2026-11-09
Honey gourami
Trichogaster chuna		 5.5 cm20 gal23–27 °C6–7.5 peaceful4+ 1 2 3 medium2026-11-09
Indian glassfish
Parambassis ranga		 8 cm20 gal20–30 °C7–8 peaceful6+ 1 2 high2026-11-09
Jack Dempsey
Rocio octofasciata		 25 cm80 gal22–30 °C7–8 aggressive— 1 2 3 high2026-11-09
Jewel cichlid
Hemichromis bimaculatus / H. guttatus group (now Rubricatochromis)		 15 cm30 gal24–26 °C6.5–7.5 aggressive2+ 1 2 3 medium2026-11-09
Julii corydoras
Corydoras julii (now Hoplisoma julii)		 5.5 cm20 gal23–26 °C6–7.5 peaceful6+ 1 2 3 medium2026-11-09
Kissing gourami
Helostoma temminckii		 30 cm125 gal23–27 °C6–8 semi-aggressive— 1 2 3 high2026-11-09
Kribensis
Pelvicachromis pulcher		 10 cm20 gal24–26 °C5–7.5 semi-aggressive2+ 1 2 3 high2026-11-09
Kuhli loach
Pangio semicincta / P. kuhlii (trade)		 10 cm20 gal23–26 °C5.5–6.5 peaceful6+ 1 2 3 high2026-11-09
Lambchop rasbora
Trigonostigma espei		 3 cm15 gal23–28 °C5.5–7.5 peaceful8+ 1 2 medium2026-11-09
Lemon tetra
Hyphessobrycon pulchripinnis		 4 cm20 gal23–28 °C5.5–7.5 peaceful8+ 1 2 3 high2026-11-09
Lyretail killifish
Aphyosemion australe		 6 cm10 gal21–24 °C6–7 peaceful2+ 1 2 medium2026-11-09
Malaysian trumpet snail
Melanoides tuberculata		 2.5 cm5 gal21–27 °C7–7.5 peaceful— 1 2 3 high2026-11-09
Marbled hatchetfish
Carnegiella strigata		 3.5 cm20 gal24–28 °C5–7 peaceful10+ 1 2 3 medium2026-11-09
Medaka
Oryzias latipes		 4 cm10 gal18–22 °C7–8 peaceful8+ 1 2 medium2026-11-09
Molly
Poecilia sphenops		 8 cm30 gal21–28 °C7–8.5 peaceful3+ 1 2 3 medium2026-11-09
Moonlight gourami
Trichopodus microlepis		 14 cm30 gal26–30 °C6–7 peaceful— 1 2 3 medium2026-11-09
Multies (shell dweller)
Neolamprologus multifasciatus		 4.5 cm15 gal24–26 °C8–9 semi-aggressive3+ 1 2 3 medium2026-11-09
Mystery snail
Pomacea diffusa		 5 cm5 gal21–26 °C7.5–8.5 peaceful— 1 2 high2026-11-09
Neon tetra
Paracheirodon innesi		 3 cm15 gal21–25 °C5–7 peaceful8+ 1 2 3 high2026-11-09
Nerite snail
Neritina spp. (e.g. N. natalensis)		 2.5 cm5 gal22–25 °C7–8 peaceful— 1 2 3 medium2026-11-09
Odessa barb
Pethia padamya		 4.6 cm20 gal16–25 °C6.5–8.5 peaceful8+ 1 2 low2026-11-09
Oscar
Astronotus ocellatus		 35 cm145 gal23–25 °C6–7.5 semi-aggressive— 1 2 3 4 high2026-11-09
Otocinclus
Otocinclus spp. (trade mostly O. vittatus/macrospilus/vestitus)		 4 cm10 gal22–26 °C6–7.5 peaceful6+ 1 2 3 4 high2026-11-09
Panda corydoras
Corydoras panda (now Hoplisoma panda)		 5 cm20 gal22–25 °C6–7 peaceful6+ 1 2 3 high2026-11-09
Paradise fish
Macropodus opercularis		 8 cm20 gal17–22 °C6–8 aggressive— 1 2 3 high2026-11-09
Pea puffer
Carinotetraodon travancoricus		 3.5 cm5 gal23–28 °C7.5–8 aggressive— 1 2 3 4 high2026-11-09
Peacock cichlid
Aulonocara spp. (profile: A. stuartgranti)		 15 cm65 gal23–26 °C7.7–8.4 semi-aggressive— 1 2 3 medium2026-11-09
Pearl danio
Danio albolineatus		 6 cm30 gal20–25 °C6–8 peaceful8+ 1 2 medium2026-11-09
Pearl gourami
Trichopodus leerii		 12 cm30 gal24–28 °C6–8 peaceful— 1 2 3 high2026-11-09
Penguin tetra
Thayeria boehlkei		 3.6 cm20 gal23–27 °C6–7.5 peaceful6+ 1 2 3 medium2026-11-09
Peppered corydoras
Corydoras paleatus (now Hoplisoma paleatum)		 7 cm25 gal22–26 °C6.5–7 peaceful6+ 1 2 3 high2026-11-09
Pictus catfish
Pimelodus pictus		 12 cm65 gal22–25 °C6–6.8 semi-aggressive3+ 1 2 3 high2026-11-09
Platy
Xiphophorus maculatus		 5 cm15 gal22–25 °C7–8 peaceful3+ 1 2 3 high2026-11-09
Pygmy corydoras
Corydoras pygmaeus (now Gastrodermus pygmaeus)		 3 cm10 gal22–26 °C6.4–7.4 peaceful6+ 1 2 3 4 high2026-11-09
Rainbow shark
Epalzeorhynchos frenatum		 15 cm65 gal24–26 °C6.5–7.5 semi-aggressive— 1 2 3 4 high2026-11-09
Ramshorn snail
Planorbidae (mainly Planorbella duryi)		 2.5 cm5 gal18–27 °C7–8 peaceful— 1 2 3 high2026-11-09
Red phantom tetra
Hyphessobrycon sweglesi		 3.5 cm20 gal22–25 °C5.5–7.5 peaceful8+ 1 2 3 low2026-11-09
Red rainbowfish
Glossolepis incisa		 15 cm40 gal24–29 °C7–8 peaceful6+ 1 2 low2026-11-09
Red-tail shark
Epalzeorhynchos bicolor		 13 cm65 gal22–26 °C6.5–7.5 semi-aggressive— 1 2 3 4 high2026-11-09
Reticulated hillstream loach
Sewellia lineolata		 6.5 cm30 gal20–24 °C6.5–7.5 peaceful6+ 1 2 3 medium2026-11-09
Rosy barb
Pethia conchonius		 10 cm40 gal18–22 °C6–8 peaceful8+ 1 2 3 medium2026-11-09
Rubber-lip pleco
Chaetostoma spp. (trade mostly C. formosae / C. milesi)		 13 cm30 gal22–24 °C6.5–7.8 peaceful— 1 2 3 medium2026-11-09
Rummy-nose tetra
Hemigrammus rhodostomus		 5 cm20 gal24–27 °C5.5–7 peaceful10+ 1 2 3 medium2026-11-09
Sailfin molly
Poecilia latipinna		 15 cm40 gal21–26 °C7–8.5 semi-aggressive3+ 1 2 medium2026-11-09
Sailfin pleco
Pterygoplichthys gibbiceps		 50 cm145 gal23–27 °C6.5–7.5 peaceful— 1 2 high2026-11-09
Scissortail rasbora
Rasbora trilineata		 13 cm75 gal22–25 °C6–8 peaceful6+ 1 2 3 medium2026-11-09
Senegal bichir
Polypterus senegalus		 35 cm145 gal25–28 °C6.5–7.5 semi-aggressive— 1 2 3 medium2026-11-09
Serpae tetra
Hyphessobrycon eques		 4 cm20 gal23–26 °C5–7.5 semi-aggressive12+ 1 2 3 high2026-11-09
Severum
Heros efasciatus / H. severus (trade 'severum')		 20 cm65 gal24–29 °C6–6.5 semi-aggressive— 1 2 3 medium2026-11-09
Siamese algae eater
Crossocheilus oblongus / C. langei (trade)		 15 cm80 gal24–26 °C6.5–7.5 peaceful3+ 1 2 3 4 medium2026-11-09
Silver hatchetfish
Gasteropelecus sternicla		 4 cm40 gal23–26 °C6–7 peaceful6+ 1 2 3 medium2026-11-09
Silvertip tetra
Hasemania nana		 5 cm20 gal23–28 °C6–8 peaceful6+ 1 2 3 medium2026-11-09
Sparkling gourami
Trichopsis pumila		 4 cm15 gal25–27 °C6–7 peaceful2+ 1 2 3 medium2026-11-09
Spotted blue-eye
Pseudomugil gertrudae		 3.8 cm10 gal25–28 °C4.5–7.5 peaceful8+ 1 2 medium2026-11-09
Sterbai corydoras
Corydoras sterbai (now Hoplisoma sterbai)		 6.8 cm20 gal24–28 °C6.6–7.6 peaceful6+ 1 2 3 high2026-11-09
Striped raphael catfish
Platydoras armatulus		 24 cm30 gal24–30 °C5.8–7.5 peaceful— 1 2 medium2026-11-09
Swordtail
Xiphophorus hellerii		 14 cm40 gal22–27 °C7–8 semi-aggressive3+ 1 2 3 medium2026-11-09
Threadfin rainbowfish
Iriatherina werneri		 4 cm15 gal26–30 °C6–8 peaceful6+ 1 2 medium2026-11-09
Three-line corydoras
Corydoras trilineatus (now Hoplisoma trilineatum)		 6 cm20 gal22–26 °C6–7.2 peaceful6+ 1 2 3 high2026-11-09
Three-spot gourami
Trichopodus trichopterus		 15 cm30 gal24–27 °C6–7.5 semi-aggressive— 1 2 3 high2026-11-09
Tiger barb
Puntigrus tetrazona		 7 cm30 gal20–26 °C6–8 semi-aggressive8+ 1 2 3 high2026-11-09
Tinfoil barb
Barbonymus schwanenfeldii		 35 cm200 gal22–25 °C6–8 semi-aggressive6+ 1 2 3 high2026-11-09
Turquoise rainbowfish
Melanotaenia lacustris		 12 cm40 gal20–24 °C7–8 peaceful6+ 1 2 medium2026-11-09
Upside-down catfish
Synodontis nigriventris		 10 cm30 gal24–26 °C6–7.5 peaceful5+ 1 2 3 medium2026-11-09
Variatus platy
Xiphophorus variatus		 6 cm15 gal20–25 °C7–8 peaceful3+ 1 2 medium2026-11-09
White cloud mountain minnow
Tanichthys albonubes		 4 cm15 gal18–22 °C6–8 peaceful10+ 1 2 3 high2026-11-09
X-ray tetra
Pristella maxillaris		 4.5 cm15 gal24–28 °C6–7.5 peaceful6+ 1 2 medium2026-11-09
Yellow tail acei
Pseudotropheus sp. 'acei' (syn. P. elegans)		 15 cm80 gal24–26 °C7.6–8.5 semi-aggressive— 1 2 medium2026-11-09
Yoyo loach
Botia almorhae		 15 cm65 gal24–27 °C6–7.5 semi-aggressive6+ 1 2 3 high2026-11-09
Zebra danio
Danio rerio		 5 cm30 gal18–24 °C6–8 peaceful8+ 1 2 3 high2026-11-09
Zebra loach
Botia striata		 9 cm30 gal23–26 °C6–7.5 peaceful6+ 1 2 3 4 high2026-11-09
Zebra pleco
Hypancistrus zebra		 8 cm20 gal26–30 °C6.5–7 peaceful— 1 2 3 high2026-11-09

Confidence: high = sources agree; medium = minor disagreements, cautious value used; low = thin data. Bioload in the checker is computed from adult length, not from a source. See how it works. Found an error? Report it.