Aquarium stocking calculator
Add species to a to-scale tank — every change re-scores instantly, and every warning explains itself.
Species shelf
359Tap + to add a species, or drag it into the tank. Shoaling fish arrive as a proper group.
Tetras & characins · 28
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
Black Phantom Tetra
Hyphessobrycon megalopterus
Black Skirt Tetra
Gymnocorymbus ternetzi
Bleeding Heart Tetra
Hyphessobrycon erythrostigma
Bloodfin Tetra
Aphyocharax anisitsi
Buenos Aires Tetra
Hyphessobrycon anisitsi
Cardinal Tetra
Paracheirodon axelrodi
Cochu's Blue Tetra
Boehlkea fredcochui
Congo Tetra
Phenacogrammus interruptus
Diamond Tetra
Moenkhausia pittieri
Ember Tetra
Hyphessobrycon amandae
Emperor Tetra
Nematobrycon palmeri
Flame Tetra
Hyphessobrycon flammeus
Glowlight Tetra
Hemigrammus erythrozonus
Golden Pencilfish
Nannostomus beckfordi
Golden Tetra
Hemigrammus rodwayi
Green Neon Tetra
Paracheirodon simulans
Head-and-Tail-Light Tetra
Hemigrammus ocellifer
Lemon Tetra
Hyphessobrycon pulchripinnis
Marble Hatchetfish
Carnegiella strigata
Neon Tetra
Paracheirodon innesi
Penguin Tetra
Thayeria boehlkei
Purple Emperor Tetra
Inpaichthys kerri
Rosy Tetra
Hyphessobrycon rosaceus
Rummynose Tetra
Hemigrammus rhodostomus
Serpae Tetra
Hyphessobrycon eques
Silver Tip Tetra
Hasemania nana
X-ray Tetra
Pristella maxillaris
Barbs, rasboras & danios · 37
Bala Shark
Balantiocheilos melanopterus
Black Moor Goldfish
Carassius auratus
Black Ruby Barb
Pethia nigrofasciata
Blackline Rasbora
Rasbora borapetensis
Celestial Pearl Danio
Danio margaritatus
Checkered Barb
Oliotius oligolepis
Cherry Barb
Puntius titteya
Chili Rasbora
Boraras brigittae
Comet Goldfish
Carassius auratus
Common Goldfish
Carassius auratus
Denison Barb
Sahyadria denisonii
Doctor Fish
Garra rufa
Dwarf Rasbora
Boraras maculatus
Fantail Goldfish
Carassius auratus
Glowlight Danio
Danio choprae
Gold Barb
Barbodes semifasciolatus
Harlequin Rasbora
Trigonostigma heteromorpha
Lambchop Rasbora
Trigonostigma espei
Leopard Danio
Danio rerio var. frankei
Odessa Barb
Pethia padamya
Oranda Goldfish
Carassius auratus
Pearl Danio
Danio albolineatus
Rainbow Shark
Epalzeorhynchos frenatum
Ranchu Goldfish
Carassius auratus
Red-Tail Shark
Epalzeorhynchos bicolor
Reticulated Flying Fox
Crossocheilus reticulatus
Rosy Barb
Pethia conchonius
Rosy Red Minnow
Pimephales promelas
Ryukin Goldfish
Carassius auratus
Scissortail Rasbora
Rasbora trilineata
Shubunkin Goldfish
Carassius auratus
Siamese Algae Eater
Crossocheilus oblongus
Strawberry Rasbora
Boraras naevus
Telescope Goldfish
Carassius auratus
Tiger Barb
Puntigrus tetrazona
White Cloud Mountain Minnow
Tanichthys albonubes
Zebra Danio
Danio rerio
Livebearers · 8
Endler's Livebearer
Poecilia wingei
Guppy
Poecilia reticulata
Least Killifish
Heterandria formosa
Molly
Poecilia sphenops
Platy
Xiphophorus maculatus
Sailfin Molly
Poecilia latipinna
Swordtail
Xiphophorus hellerii
Wrestling Halfbeak
Dermogenys pusilla
Bettas & gouramis · 12
Betta (Siamese Fighting Fish)
Betta splendens
Chocolate Gourami
Sphaerichthys osphromenoides
Dwarf Gourami
Trichogaster lalius
Honey Gourami
Trichogaster chuna
Kissing Gourami
Helostoma temminckii
Moonlight Gourami
Trichopodus microlepis
Paradise Fish
Macropodus opercularis
Peaceful Betta
Betta imbellis
Pearl Gourami
Trichopodus leerii
Sparkling Gourami
Trichopsis pumila
Thick-lipped Gourami
Trichogaster labiosa
Three-spot Gourami
Trichopodus trichopterus
Catfish & corys · 33
Adonis Pleco
Acanthicus adonis
Agassiz's Cory
Corydoras agassizii
Banjo Catfish
Bunocephalus coracoideus
Bristlenose Pleco
Ancistrus cf. cirrhosus
Bronze Corydoras
Corydoras aeneus
Clown Pleco
Panaqolus maccus
Common Pleco
Pterygoplichthys pardalis
Cuckoo Catfish
Synodontis multipunctatus
Dwarf Petricola Catfish
Synodontis lucipinnis
Emerald Cory
Corydoras splendens
Even-spotted Synodontis
Synodontis petricola
Featherfin Squeaker
Synodontis eupterus
Glass Catfish
Kryptopterus vitreolus
Iridescent Shark
Pangasianodon hypophthalmus
Julii Cory
Corydoras julii
Little Corydoras
Corydoras nanus
Otocinclus
Otocinclus vittatus
Panda Corydoras
Corydoras panda
Peppered Corydoras
Corydoras paleatus
Pictus Catfish
Pimelodus pictus
Pygmy Corydoras
Corydoras pygmaeus
Red Whiptail Catfish
Rineloricaria sp. 'Red'
Royal Pleco
Panaque nigrolineatus
Rubber Lip Pleco
Chaetostoma formosae
Sailfin Pleco
Pterygoplichthys gibbiceps
Salt and Pepper Cory
Corydoras habrosus
Skunk Cory
Corydoras arcuatus
Spotted Hoplo
Megalechis thoracata
Sterbai Corydoras
Corydoras sterbai
Striped Raphael Catfish
Platydoras armatulus
Upside-down Catfish
Synodontis nigriventris
Venezuelan Cory
Corydoras venezuelanus
Zebra Pleco
Hypancistrus zebra
Loaches · 9
Borneo Sucker
Gastromyzon ctenocephalus
Butterfly Hillstream Loach
Beaufortia leveretti
Clown Loach
Chromobotia macracanthus
Dojo (Weather) Loach
Misgurnus anguillicaudatus
Dwarf Chain Loach
Ambastaia sidthimunki
Kuhli Loach
Pangio kuhlii
Polka Dot Loach
Botia kubotai
Reticulated Hillstream Loach
Sewellia lineolata
Yoyo Loach
Botia almorhae
Rainbowfish · 7
Boesemani Rainbowfish
Melanotaenia boesemani
Celebes Rainbowfish
Marosatherina ladigesi
Dwarf Neon Rainbowfish
Melanotaenia praecox
Forktail Rainbowfish
Pseudomugil furcatus
Red Rainbowfish
Glossolepis incisus
Threadfin Rainbowfish
Iriatherina werneri
Turquoise Rainbowfish
Melanotaenia lacustris
Dwarf cichlids · 13
African Butterfly Cichlid
Anomalochromis thomasi
Agassiz's Dwarf Cichlid
Apistogramma agassizii
Bolivian Ram
Mikrogeophagus altispinosus
Checkerboard Cichlid
Dicrossus filamentosus
Cockatoo Dwarf Cichlid
Apistogramma cacatuoides
Congo Dwarf Cichlid
Nanochromis parilus
Dwarf Flag Cichlid
Laetacara curviceps
German Blue Ram
Mikrogeophagus ramirezi
Golden Dwarf Cichlid
Nannacara anomala
Kribensis
Pelvicachromis pulcher
Macmasteri Dwarf Cichlid
Apistogramma macmasteri
Striped Kribensis
Pelvicachromis taeniatus
Umbrella Dwarf Cichlid
Apistogramma borellii
American cichlids · 34
Altum Angelfish
Pterophyllum altum
Angelfish
Pterophyllum scalare
Blood Parrot Cichlid
Amphilophus citrinellus × Vieja melanurus
Blue Acara
Andinoacara pulcher
Chocolate Cichlid
Hypselecara temporalis
Convict Cichlid
Amatitlania nigrofasciata
Demon Eartheater
Satanoperca jurupari
Discus
Symphysodon aequifasciatus
Ellioti Cichlid
Thorichthys ellioti
Festivum (Flag Cichlid)
Mesonauta festivus
Firemouth Cichlid
Thorichthys meeki
Green Discus
Symphysodon tarzoo
Green Terror
Andinoacara rivulatus
Heckel Discus
Symphysodon discus
Jack Dempsey
Rocio octofasciata
Jaguar Cichlid
Parachromis managuensis
Keyhole Cichlid
Cleithracara maronii
Oscar
Astronotus ocellatus
Paraguay Eartheater
Gymnogeophagus balzanii
Peacock Bass
Cichla ocellaris
Pike Cichlid
Crenicichla lugubris
Port Cichlid
Cichlasoma portalegrense
Rainbow Cichlid
Herotilapia multispinosa
Red Devil
Amphilophus labiatus
Red Terror
Mesoheros festae
Redhead Cichlid
Vieja melanura
Salvini Cichlid
Trichromis salvini
Severum
Heros efasciatus
Sveni Eartheater
Geophagus sveni
T-Bar Cichlid
Amatitlania sajica
Texas Cichlid
Herichthys cyanoguttatus
Threadfin Acara
Acarichthys heckelii
Uaru (Triangle Cichlid)
Uaru amphiacanthoides
Wolf Cichlid
Parachromis dovii
Lake Malawi cichlids · 30
Acei Cichlid
Pseudotropheus acei
Auratus Cichlid
Melanochromis auratus
Blue Dolphin Cichlid
Cyrtocara moorii
Borleyi (Redfin Hap)
Copadichromis borleyi
Bumblebee Cichlid
Pseudotropheus crabro
Cobalt Blue Zebra
Metriaclima callainos
Demasoni Cichlid
Chindongo demasoni
Dogtooth Cichlid
Cynotilapia afra
Electric Blue Ahli
Sciaenochromis fryeri
Electric Yellow Lab
Labidochromis caeruleus
Elongate Mbuna
Pseudotropheus elongatus
Hongi Cichlid
Labidochromis sp. 'Hongi'
Johanni Cichlid
Melanochromis johannii
Kenyi Cichlid
Maylandia lombardoi
Livingstoni
Nimbochromis livingstonii
Maingano Cichlid
Melanochromis cyaneorhabdos
Malawi Eyebiter
Dimidiochromis compressiceps
Malawi Hawk
Aristochromis christyi
Peacock Cichlid
Aulonocara stuartgranti
Powder Blue Cichlid
Chindongo socolofi
Red Empress
Protomelas taeniolatus
Red Zebra Cichlid
Maylandia estherae
Rostratus
Fossorochromis rostratus
Rusty Cichlid
Iodotropheus sprengerae
Saulosi Cichlid
Chindongo saulosi
Star Sapphire
Placidochromis phenochilus
Sunshine Peacock
Aulonocara baenschi
Taiwan Reef Cichlid
Protomelas sp. Steveni Taiwan
Venustus (Giraffe Cichlid)
Nimbochromis venustus
Zebra Mbuna
Maylandia zebra
Lake Tanganyika cichlids · 21
Brevis Shell Dweller
Neolamprologus brevis
Brichardi (Fairy Cichlid)
Neolamprologus brichardi
Calvus Cichlid
Altolamprologus calvus
Compressiceps Cichlid
Altolamprologus compressiceps
Cylindricus Cichlid
Neolamprologus cylindricus
Cyprichromis
Cyprichromis leptosoma
Duboisi Tropheus
Tropheus duboisi
Five-bar Cichlid
Neolamprologus tretocephalus
Frontosa
Cyphotilapia frontosa
Goby Cichlid
Eretmodus cyanostictus
Golden Julie
Julidochromis ornatus
Lemon Cichlid
Neolamprologus leleupi
Marlieri Cichlid
Julidochromis marlieri
Masked Julie
Julidochromis transcriptus
Multifasciatus Shell Dweller
Neolamprologus multifasciatus
Ocellatus Shell Dweller
Neolamprologus ocellatus
Regan's Julie
Julidochromis regani
Sand-sifting Xenotilapia
Xenotilapia spilopterus
Similis Shell Dweller
Neolamprologus similis
Threadfin Petrochromis
Petrochromis trewavasae
Tropheus
Tropheus moorii
Other African cichlids · 3
Brichard's Teleogramma
Teleogramma brichardi
Buffalohead Cichlid
Steatocranus casuarius
Jewel Cichlid
Hemichromis bimaculatus
Other fish · 16
African Butterflyfish
Pantodon buchholzi
Bumblebee Goby
Brachygobius doriae
Chinese Algae Eater
Gyrinocheilus aymonieri
Clown Killifish
Epiplatys annulatus
Dwarf Pea Puffer
Carinotetraodon travancoricus
Elephantnose Fish
Gnathonemus petersii
Endlicheri Bichir
Polypterus endlicherii
Figure-8 Puffer
Dichotomyctere ocellatus
Golden Wonder Killifish
Aplocheilus lineatus
Green Spotted Pufferfish
Dichotomyctere nigroviridis
Koi
Cyprinus carpio
Medaka Ricefish
Oryzias latipes
Ornate Bichir
Polypterus ornatipinnis
Scarlet Badis
Dario dario
Silver Arowana
Osteoglossum bicirrhosum
Silver Moony
Monodactylus argenteus
Your tank
≈ 180 L
The tank is empty — add your first species.
Planting density
Hardscape cover
Water changes
Verdict
engine v0.1.2Your verdict panel is waiting. Add the first species and watch the engine think.
How this calculator thinks
Most stocking calculators still lean on the inch-per-gallon rule — a shortcut that treats one 25 cm oscar like twenty-five neon tetras. AquaSage doesn't. Capacity here is modelled on adult body mass and metabolism, water compatibility is the strict intersection of every species' range (never a misleading average), and shoaling fish are only ever judged as proper groups, because that's how they live.
Your aquascape is part of the verdict, too. Dense planting and hardscape genuinely reduce aggression by breaking sight lines, a weekly water-change habit genuinely raises how much life a tank can carry — so the planner treats them as first-class inputs. Slide the planting density and watch a tense pairing calm down; that's not a gimmick, it's husbandry.
And when AquaSage warns you, it tells you why: which check fired, what the numbers were, and what would fix it — with sources from the aquarist literature attached to the species data. It was built by an aquarist with several tanks of his own, tired of calculators that could only say “no” without ever explaining themselves. Treat it as a well-read second opinion, not a substitute for watching your fish.
Read the full methodology — every formula, threshold and limitation →
Common questions
- How many neon tetras fit in a 60-litre tank?
- A shoal of 8–10 neon tetras lives comfortably in a standard 60 cm, 54–60 litre tank with weekly water changes — they're tiny, but they need company more than they need space. The honest answer always depends on your filtration and maintenance, so enter your actual setup above and read the capacity meter; its assumptions are printed right on it.
- Is the inch-per-gallon rule accurate?
- No — and it never was. Fish mass grows roughly with the cube of length, so one 10 cm fish produces vastly more waste than ten 1 cm fish. AquaSage estimates bioload from each species' adult mass and activity level instead, then adjusts for your filtration, water surface and water-change habits.
- Can I trust the compatibility verdicts?
- Every verdict shows its reasoning: the exact check that fired, the numbers behind it, and a suggested fix, with cited sources on each species page. The engine is deliberately cautious and versioned, so a verdict you saw last month can be reproduced today. It's a well-informed starting point — your own eyes on your own fish are always the final judge.