Advanced aquarium fish
These species are rated difficult in our catalog: fish that need pristine water, a specific diet, or a tank built around them. They reward keepers with a few stable tanks already behind them. Each profile lists exactly what a species demands.
247 species
Achilles Tang
Acanthurus achilles9.4 in (24 cm)180 gal (680 L)75–81°F (24–27°C)
Adonis Pleco (L155)
Acanthicus adonis35.4 in (90 cm)264 gal (1,000 L)77–84°F (25–29°C)
African tigerfish
Hydrocynus vittatus29.5 in (75 cm)1,057 gal (4,000 L)75–82°F (24–28°C)
Altum angelfish
Pterophyllum altum7.1 in (18 cm)45 gal (170 L)79–90°F (26–32°C)
Amazon puffer
Colomesus asellus4.7 in (12 cm)26 gal (100 L)72–82°F (22–28°C)Anjungan licorice gourami
Parosphromenus anjunganensis1.4 in (3.5 cm)11 gal (40 L)72–82°F (22–28°C)
Annularis Angelfish
Pomacanthus annularis17.7 in (45 cm)219 gal (830 L)73–81°F (23–27°C)
Arabian toothcarp
Aphanius dispar2.8 in (7 cm)30 gal (115 L)59–86°F (15–30°C)
Arapaima
Arapaima gigas118.1 in (300 cm)10,567 gal (40,000 L)77–86°F (25–30°C)
Asian arowana
Scleropages formosus35.4 in (90 cm)264 gal (1,000 L)75–86°F (24–30°C)
Asian banjo catfish
Acrochordonichthys rugosus4.3 in (11 cm)25 gal (95 L)64–75°F (18–24°C)
Asian redtail catfish
Hemibagrus wyckioides39.4 in (100 cm)450 gal (1,703 L)72–82°F (22–28°C)
Banded Archerfish
Toxotes jaculatrix11.8 in (30 cm)119 gal (450 L)77–86°F (25–30°C)
Banded darter
Etheostoma zonale3.1 in (7.8 cm)26 gal (100 L)59–70°F (15–21°C)
Banded pipefish
Dunckerocampus dactyliophorus7.5 in (19 cm)53 gal (200 L)75–81°F (24–27°C)
Bandit Angelfish
Apolemichthys arcuatus7.1 in (18 cm)90 gal (340 L)73–79°F (23–26°C)
Biara
Rhaphiodon vulpinus31.5 in (80 cm)660 gal (2,500 L)73–82°F (23–28°C)
Bigtooth river stingray
Potamotrygon henlei21.7 in (55 cm)396 gal (1,500 L)75–82°F (24–28°C)
Black arowana
Osteoglossum ferreirai35.4 in (90 cm)396 gal (1,500 L)79–86°F (26–30°C)
Black devil stingray
Potamotrygon leopoldi23.6 in (60 cm)436 gal (1,650 L)68–84°F (20–29°C)
Black ghost knifefish
Apteronotus albifrons17.7 in (45 cm)85 gal (320 L)75–82°F (24–28°C)
Black Pacu
Colossoma macropomum39.4 in (100 cm)660 gal (2,500 L)72–82°F (22–28°C)
Black Shark
Labeo chrysophekadion23.6 in (60 cm)660 gal (2,500 L)68–79°F (20–26°C)Black toraja goby
Mugilogobius sarasinorum3.1 in (8 cm)21 gal (80 L)79–82°F (26–28°C)Blue axelrodi rasbora
Sundadanio axelrodi0.8 in (2 cm)12 gal (45 L)73–79°F (23–26°C)
Blue Hippo Tang
Paracanthurus hepatus11.8 in (30 cm)180 gal (680 L)73–81°F (23–27°C)Blue neon dwarf goby
Stiphodon atropurpureus2 in (5 cm)20 gal (75 L)72–81°F (22–27°C)Blue Phantom Pleco (L128)
Hemiancistrus sp. L1289.8 in (25 cm)66 gal (250 L)81–86°F (27–30°C)
Blue whale catfish
Cetopsis coecutiens10.6 in (27 cm)70 gal (265 L)72–79°F (22–26°C)
Blue-eyed pleco
Panaque cochliodon11.8 in (30 cm)119 gal (450 L)73–82°F (23–28°C)
Blueface Angelfish
Pomacanthus xanthometopon15 in (38 cm)219 gal (830 L)73–81°F (23–27°C)
Bluespine Unicornfish
Naso unicornis23.6 in (60 cm)396 gal (1,500 L)75–81°F (24–27°C)
Bluestreak Cleaner Wrasse
Labroides dimidiatus4.3 in (11 cm)106 gal (400 L)75–81°F (24–27°C)
Bluestripe pipefish
Doryrhamphus excisus2.8 in (7 cm)26 gal (100 L)75–81°F (24–27°C)
Blunt-jawed elephantnose
Campylomormyrus tamandua15.7 in (40 cm)172 gal (650 L)73–82°F (23–28°C)
Blunthead cichlid
Tropheus moorii5.5 in (14 cm)92 gal (350 L)75–81°F (24–27°C)
Bolt catfish
Aguarunichthys torosus13.4 in (34 cm)120 gal (455 L)72–81°F (22–27°C)
Borneo glass catfish
Ompok eugeneiatus6.5 in (16.5 cm)45 gal (170 L)70–82°F (21–28°C)Bottlenose catfish
Ageneiosus marmoratus7.9 in (20 cm)95 gal (360 L)72–79°F (22–26°C)
Brazilian seahorse
Hippocampus reidi6.7 in (17 cm)29 gal (110 L)72–81°F (22–27°C)
Brook stickleback
Culaea inconstans1.8 in (4.5 cm)20 gal (75 L)50–68°F (10–20°C)
Brown ghost knifefish
Apteronotus leptorhynchus11.8 in (30 cm)85 gal (320 L)75–84°F (24–29°C)Brown's betta
Betta brownorum1.2 in (3 cm)11 gal (40 L)75–82°F (24–28°C)Brunei beauty betta
Betta macrostoma3.9 in (10 cm)20 gal (75 L)72–79°F (22–26°C)
Bubble Eye
Carassius auratus5.9 in (15 cm)20 gal (75 L)64–73°F (18–23°C)
Bulldog pleco
Chaetostoma formosae4.3 in (11 cm)40 gal (150 L)68–77°F (20–25°C)Bullseye snakehead
Channa marulius47.2 in (120 cm)396 gal (1,500 L)72–82°F (22–28°C)
Bumblebee goby
Brachygobius doriae1.6 in (4 cm)12 gal (45 L)72–82°F (22–28°C)
Butterfly peacock bass
Cichla ocellaris29.1 in (74 cm)211 gal (800 L)75–82°F (24–28°C)
Canara pearlspot
Etroplus canarensis4.3 in (11 cm)55 gal (210 L)72–90°F (22–32°C)
Celebes halfbeak
Nomorhamphus liemi3.5 in (9 cm)40 gal (150 L)68–77°F (20–25°C)
Celebes rainbow
Marosatherina ladigesi3.1 in (8 cm)25 gal (95 L)72–82°F (22–28°C)
Celestial Eye
Carassius auratus5.9 in (15 cm)20 gal (75 L)64–73°F (18–23°C)
Channel catfish
Ictalurus punctatus39.4 in (100 cm)1,057 gal (4,000 L)50–86°F (10–30°C)
Chocolate frogmouth catfish
Chaca bankanensis7.9 in (20 cm)45 gal (170 L)75–82°F (24–28°C)
Clown frogfish
Antennarius maculatus5.9 in (15 cm)20 gal (75 L)75–81°F (24–27°C)
Clown Tang
Acanthurus lineatus15 in (38 cm)238 gal (900 L)75–81°F (24–27°C)
Clown Triggerfish
Balistoides conspicillum19.7 in (50 cm)300 gal (1,135 L)72–79°F (22–26°C)Cobalt blue goby
Stiphodon semoni1.8 in (4.5 cm)13 gal (50 L)68–79°F (20–26°C)
Colombian shark catfish
Ariopsis seemanni13.8 in (35 cm)225 gal (850 L)72–79°F (22–26°C)
Congo pufferfish
Tetraodon miurus5.9 in (15 cm)26 gal (100 L)75–82°F (24–28°C)
Copperband Butterflyfish
Chelmon rostratus7.9 in (20 cm)79 gal (300 L)75–81°F (24–27°C)Crocodile Catfish
Bagarius suchus27.6 in (70 cm)660 gal (2,500 L)64–73°F (18–23°C)Crossband chocolate gourami
Sphaerichthys selatanensis1.8 in (4.5 cm)16 gal (60 L)79–86°F (26–30°C)
Cupid cichlid
Biotodoma cupido4.7 in (12 cm)53 gal (200 L)68–86°F (20–30°C)
Discus
Symphysodon aequifasciatus7.9 in (20 cm)65 gal (245 L)79–90°F (26–32°C)
Divided Leopard Wrasse
Macropharyngodon bipartitus5.1 in (13 cm)55 gal (208 L)72–79°F (22–26°C)
Dragon moray
Enchelycore pardalis35.4 in (90 cm)180 gal (680 L)72–79°F (22–26°C)
Duckbill Catfish
Sorubim lima19.7 in (50 cm)190 gal (720 L)73–86°F (23–30°C)
Dwarf Mbuna
Pseudotropheus demasoni3.9 in (10 cm)53 gal (200 L)75–82°F (24–28°C)
Dwarf seahorse
Hippocampus zosterae1.4 in (3.5 cm)5 gal (20 L)68–79°F (20–26°C)
Electric catfish
Malapterurus electricus39.4 in (100 cm)198 gal (750 L)73–82°F (23–28°C)Elizabeth's dwarf cichlid
Apistogramma elizabethae2 in (5 cm)20 gal (75 L)75–84°F (24–29°C)
Emperor Angelfish
Pomacanthus imperator15 in (38 cm)185 gal (700 L)73–81°F (23–27°C)
Evansi Anthias
Pseudanthias evansi4.7 in (12 cm)75 gal (285 L)75–81°F (24–27°C)
Eyespot gourami
Parasphaerichthys ocellatus1.4 in (3.5 cm)12 gal (45 L)64–77°F (18–25°C)
Fahaka puffer
Tetraodon lineatus17.7 in (45 cm)119 gal (450 L)75–82°F (24–28°C)Fairy dwarf cichlid
Biotoecus opercularis1.6 in (4 cm)20 gal (75 L)77–86°F (25–30°C)
Featherfin cichlid
Cyathopharynx furcifer7.9 in (20 cm)119 gal (450 L)75–81°F (24–27°C)
Fire eel
Mastacembelus erythrotaenia39.4 in (100 cm)132 gal (500 L)75–82°F (24–28°C)Firewood catfish
Sorubimichthys planiceps59.1 in (150 cm)793 gal (3,000 L)72–82°F (22–28°C)
Flagfin Angelfish
Apolemichthys trimaculatus10.2 in (26 cm)100 gal (380 L)73–81°F (23–27°C)
Forest halfbeak
Hemirhamphodon pogonognathus3.5 in (9 cm)34 gal (130 L)75–82°F (24–28°C)
Fork-tailed loach
Vaillantella maassi4.7 in (12 cm)46 gal (175 L)73–84°F (23–29°C)
Frail gourami
Ctenops nobilis3.9 in (10 cm)24 gal (90 L)68–79°F (20–26°C)
French Angelfish
Pomacanthus paru16.1 in (41 cm)201 gal (760 L)72–81°F (22–27°C)
Freshwater blenny
Salaria fluviatilis5.9 in (15 cm)25 gal (95 L)54–68°F (12–20°C)
Freshwater needlefish
Xenentodon cancila13.8 in (35 cm)85 gal (320 L)66–86°F (19–30°C)
Freshwater pipefish
Doryichthys martensii5.9 in (15 cm)32 gal (120 L)75–82°F (24–28°C)Freshwater sole
Brachirus panoides7.9 in (20 cm)55 gal (208 L)73–82°F (23–28°C)
Frontosa cichlid
Cyphotilapia frontosa12.6 in (32 cm)227 gal (860 L)73–81°F (23–27°C)
Fu Manchu lionfish
Dendrochirus biocellatus5.1 in (13 cm)29 gal (110 L)75–81°F (24–27°C)
Fusco Hap
Nimbochromis fuscotaeniatus9.8 in (25 cm)74 gal (280 L)75–82°F (24–28°C)
Giant Pikehead
Luciocephalus pulcher7.9 in (20 cm)36 gal (135 L)72–79°F (22–26°C)Giant raphael catfish
Megalodoras uranoscopus23.6 in (60 cm)264 gal (1,000 L)73–82°F (23–28°C)
Giant snakehead
Channa micropeltes39.4 in (100 cm)528 gal (2,000 L)75–82°F (24–28°C)
Gilt darter
Percina evides3.5 in (9 cm)29 gal (110 L)59–70°F (15–21°C)
Glass knifefish
Eigenmannia virescens17.7 in (45 cm)85 gal (320 L)73–82°F (23–28°C)
Gold nugget pleco
Baryancistrus sp. cf. xanthellus9.8 in (25 cm)55 gal (210 L)81–90°F (27–32°C)
Golden Head Sleeper Goby
Valenciennea strigata5.9 in (15 cm)53 gal (200 L)73–81°F (23–27°C)
Golden pheasant
Callopanchax occidentalis3.1 in (8 cm)14 gal (54 L)68–75°F (20–24°C)
Goonch
Bagarius yarrelli78.7 in (200 cm)1,057 gal (4,000 L)64–75°F (18–24°C)
Granulated synodontis
Synodontis granulosus10.6 in (27 cm)79 gal (300 L)73–81°F (23–27°C)
Green chromide
Etroplus suratensis11.8 in (30 cm)145 gal (550 L)68–86°F (20–30°C)
Green Mandarin Dragonet
Synchiropus splendidus3.1 in (8 cm)29 gal (110 L)75–81°F (24–27°C)
Green spotted puffer
Dichotomyctere nigroviridis5.9 in (15 cm)32 gal (120 L)75–82°F (24–28°C)
Guineafowl puffer
Arothron meleagris19.7 in (50 cm)180 gal (680 L)75–81°F (24–27°C)
Gulf saratoga
Scleropages jardinii35.4 in (90 cm)317 gal (1,200 L)75–86°F (24–30°C)
Gulper catfish
Asterophysus batrachus9.8 in (25 cm)95 gal (360 L)72–82°F (22–28°C)
Harlequin filefish
Oxymonacanthus longirostris4.3 in (11 cm)53 gal (200 L)75–81°F (24–27°C)
Heckel discus
Symphysodon discus7.1 in (18 cm)75 gal (284 L)82–88°F (28–31°C)Hendra betta
Betta hendra1.8 in (4.5 cm)11 gal (40 L)73–81°F (23–27°C)
Honeycomb moray
Gymnothorax favagineus70.9 in (180 cm)291 gal (1,100 L)75–81°F (24–27°C)
Horseshoe betta
Betta hipposideros3.1 in (8 cm)24 gal (90 L)73–81°F (23–27°C)
Hujeta gar
Ctenolucius hujeta9.8 in (25 cm)55 gal (210 L)72–82°F (22–28°C)Hummingbird tetra
Trochilocharax ornatus0.8 in (2 cm)12 gal (45 L)73–81°F (23–27°C)
Indonesian tigerfish
Datnioides microlepis19.7 in (50 cm)180 gal (680 L)68–82°F (20–28°C)
Iridescent shark
Pangasianodon hypophthalmus39.4 in (100 cm)528 gal (2,000 L)72–79°F (22–26°C)
Jaguar cichlid
Parachromis managuensis15.7 in (40 cm)119 gal (450 L)75–82°F (24–28°C)
Jau catfish
Zungaro zungaro55.1 in (140 cm)793 gal (3,000 L)72–82°F (22–28°C)
Kaligono
Nimbochromis polystigma10.2 in (26 cm)74 gal (280 L)75–82°F (24–28°C)
Knife livebearer
Alfaro cultratus3 in (7.6 cm)32 gal (120 L)75–82°F (24–28°C)
Knight goby
Stigmatogobius sadanundio3.5 in (9 cm)21 gal (80 L)68–79°F (20–26°C)
Koran Angelfish
Pomacanthus semicirculatus15.7 in (40 cm)132 gal (500 L)73–81°F (23–27°C)
Largescale four-eyed fish
Anableps anableps11.8 in (30 cm)70 gal (265 L)77–88°F (25–31°C)
Leaf scorpionfish
Taenianotus triacanthus5.1 in (13 cm)29 gal (110 L)72–79°F (22–26°C)Leopard Cactus Pleco (L114)
Pseudacanthicus cf. leopardus13.8 in (35 cm)106 gal (400 L)81–88°F (27–31°C)
Leopard Wrasse
Macropharyngodon meleagris5.9 in (15 cm)90 gal (340 L)72–79°F (22–26°C)
Licorice gourami
Parosphromenus deissneri1.5 in (3.8 cm)11 gal (40 L)72–82°F (22–28°C)
Lined seahorse
Hippocampus erectus7.1 in (18 cm)29 gal (110 L)68–79°F (20–26°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)
Livingston's cichlid
Nimbochromis livingstonii9.8 in (25 cm)74 gal (280 L)75–82°F (24–28°C)
Longhorn Cowfish
Lactoria cornuta18.1 in (46 cm)250 gal (946 L)75–81°F (24–27°C)
Longnose distichodus
Distichodus lusosso15 in (38 cm)119 gal (450 L)72–81°F (22–27°C)
Lyretail grouper
Variola louti31.5 in (80 cm)291 gal (1,100 L)75–81°F (24–27°C)
Majestic Angelfish
Pomacanthus navarchus11.8 in (30 cm)145 gal (550 L)73–81°F (23–27°C)
Malawi eyebiter
Dimidiochromis compressiceps9.8 in (25 cm)66 gal (250 L)73–82°F (23–28°C)
Malayan leaf fish
Pristolepis fasciata7.9 in (20 cm)40 gal (150 L)73–82°F (23–28°C)Map puffer
Arothron mappa23.6 in (60 cm)238 gal (900 L)75–81°F (24–27°C)
Marbled sailfin pim
Leiarius marmoratus39.4 in (100 cm)528 gal (2,000 L)72–79°F (22–26°C)
Mbu puffer
Tetraodon mbu26.4 in (67 cm)396 gal (1,500 L)75–82°F (24–28°C)
Mekong tiger perch
Datnioides undecimradiatus15.7 in (40 cm)119 gal (450 L)75–82°F (24–28°C)
Midas Cichlid
Amphilophus citrinellus13.8 in (35 cm)79 gal (300 L)70–79°F (21–26°C)
Miniatus grouper
Cephalopholis miniata17.7 in (45 cm)180 gal (680 L)72–79°F (22–26°C)
Moorish Idol
Zanclus cornutus9.1 in (23 cm)125 gal (473 L)72–79°F (22–26°C)
Multibarred Angelfish
Paracentropyge multifasciata4.7 in (12 cm)59 gal (225 L)72–79°F (22–26°C)
Northern Studfish
Fundulus catenatus5.9 in (15 cm)37 gal (140 L)59–77°F (15–25°C)
Ocellate river stingray
Potamotrygon motoro19.7 in (50 cm)264 gal (1,000 L)75–82°F (24–28°C)
Orange chromide
Etroplus maculatus3.9 in (10 cm)55 gal (210 L)68–82°F (20–28°C)
Orangethroat darter
Etheostoma spectabile2.8 in (7 cm)25 gal (95 L)59–68°F (15–20°C)
Orbiculate batfish
Platax orbicularis19.7 in (50 cm)185 gal (700 L)75–81°F (24–27°C)
Ornate Pimelodus
Pimelodus ornatus12.2 in (31 cm)65 gal (245 L)75–82°F (24–28°C)
Painted frogfish
Antennarius pictus11.8 in (30 cm)29 gal (110 L)75–81°F (24–27°C)Panda loach
Yaoshania pachychilus2.8 in (7 cm)20 gal (75 L)64–75°F (18–24°C)
Paradise Threadfin
Polynemus paradiseus9.8 in (25 cm)75 gal (285 L)75–82°F (24–28°C)
Paroon shark
Pangasius sanitwongsei118.1 in (300 cm)2,113 gal (8,000 L)72–79°F (22–26°C)
Payara
Hydrolycus armatus35 in (89 cm)1,057 gal (4,000 L)75–82°F (24–28°C)
Peacock grouper
Cephalopholis argus23.6 in (60 cm)251 gal (950 L)75–81°F (24–27°C)
Persephone betta
Betta persephone1.4 in (3.5 cm)11 gal (40 L)73–81°F (23–27°C)
Peter’s elephantnose
Gnathonemus petersii8.9 in (22.5 cm)66 gal (250 L)73–82°F (23–28°C)
Pinnatus batfish
Platax pinnatus17.7 in (45 cm)198 gal (750 L)75–81°F (24–27°C)
Pinstripe damba cichlid
Paretroplus menarambo9.8 in (25 cm)95 gal (360 L)79–84°F (26–29°C)
Piraiba
Brachyplatystoma filamentosum118.1 in (300 cm)2,642 gal (10,000 L)72–82°F (22–28°C)
Potter's Angelfish
Centropyge potteri5.1 in (13 cm)65 gal (245 L)72–79°F (22–26°C)
Powder Blue Tang
Acanthurus leucosternon9.1 in (23 cm)124 gal (470 L)75–81°F (24–27°C)
Purple Queen Anthias
Pseudanthias tuka4.7 in (12 cm)75 gal (285 L)75–81°F (24–27°C)Pygmy driftwood catfish
Trachelyichthys exilis3.1 in (8 cm)21 gal (80 L)72–77°F (22–25°C)
Queen Angelfish
Holacanthus ciliaris17.7 in (45 cm)251 gal (950 L)75–81°F (24–27°C)
Queen triggerfish
Balistes vetula19.7 in (50 cm)238 gal (900 L)72–81°F (22–27°C)
Radiant Wrasse
Halichoeres iridis4.5 in (11.5 cm)75 gal (284 L)72–79°F (22–26°C)
Radiata Lionfish
Pterois radiata9.4 in (24 cm)70 gal (265 L)72–79°F (22–26°C)
Rainbow stiphodon
Stiphodon ornatus2.6 in (6.5 cm)13 gal (50 L)68–79°F (20–26°C)
Red tail barracuda
Acestrorhynchus falcatus11.8 in (30 cm)100 gal (380 L)72–82°F (22–28°C)
Red-bellied pacu
Piaractus brachypomus34.6 in (88 cm)1,057 gal (4,000 L)73–82°F (23–28°C)
Red-bellied Piranha
Pygocentrus nattereri12.6 in (32 cm)160 gal (605 L)75–82°F (24–28°C)
Red-tail dwarf puffer
Carinotetraodon irrubesco1.8 in (4.5 cm)17 gal (65 L)72–82°F (22–28°C)Redcheek betta
Betta rutilans1.4 in (3.5 cm)11 gal (40 L)73–81°F (23–27°C)Redtail bagrid
Hemibagrus nemurus25.6 in (65 cm)185 gal (700 L)72–81°F (22–27°C)
Redtail catfish
Phractocephalus hemioliopterus39.4 in (100 cm)1,506 gal (5,700 L)68–79°F (20–26°C)
Regal Angelfish
Pygoplites diacanthus9.8 in (25 cm)124 gal (470 L)73–81°F (23–27°C)
Reticulated catfish
Perrunichthys perruno23.6 in (60 cm)185 gal (700 L)72–79°F (22–26°C)
Ribbon eel
Rhinomuraena quaesita39.4 in (100 cm)66 gal (250 L)75–81°F (24–27°C)
Ripsaw catfish
Oxydoras niger39.4 in (100 cm)396 gal (1,500 L)72–82°F (22–28°C)
Rock Beauty Angelfish
Holacanthus tricolor13.8 in (35 cm)90 gal (340 L)73–81°F (23–27°C)
Royal pleco
Panaque nigrolineatus16.9 in (43 cm)125 gal (473 L)72–82°F (22–28°C)
Ruby Red Dragonet
Synchiropus sycorax2.4 in (6 cm)53 gal (200 L)73–81°F (23–27°C)
Saddle-back Loach
Homaloptera orthogoniata4.3 in (11 cm)45 gal (170 L)68–77°F (20–25°C)
Sailfin pim
Leiarius pictus23.6 in (60 cm)396 gal (1,500 L)72–79°F (22–26°C)Scarlet Cactus Pleco (L025)
Pseudacanthicus pirarara15.7 in (40 cm)119 gal (450 L)79–86°F (26–30°C)
Scarlet goby
Rhinogobius zhoui1.6 in (4 cm)12 gal (45 L)61–75°F (16–24°C)
Schwartz's catfish
Corydoras schwartzi2.8 in (7 cm)20 gal (75 L)72–79°F (22–26°C)
Sebae mono
Monodactylus sebae7.9 in (20 cm)119 gal (450 L)75–82°F (24–28°C)Sharpnose chocolate gourami
Sphaerichthys acrostoma2.8 in (7 cm)24 gal (90 L)72–79°F (22–26°C)
Siamese tiger perch
Datnioides pulcher17.7 in (45 cm)185 gal (700 L)75–82°F (24–28°C)
Silver arowana
Osteoglossum bicirrhosum39.4 in (100 cm)396 gal (1,500 L)75–82°F (24–28°C)
Silver mono
Monodactylus argenteus9.8 in (25 cm)106 gal (400 L)75–82°F (24–28°C)
Silver scat
Selenotoca multifasciata11.8 in (30 cm)119 gal (450 L)72–82°F (22–28°C)
Six-banded distichodus
Distichodus sexfasciatus15.7 in (40 cm)143 gal (540 L)72–79°F (22–26°C)
Spadetail checkerboard cichlid
Dicrossus maculatus3.5 in (9 cm)24 gal (90 L)79–86°F (26–30°C)Spanish toothcarp
Valencia hispanica3 in (7.5 cm)20 gal (75 L)54–79°F (12–26°C)
Speckled peacock bass
Cichla temensis39 in (99 cm)396 gal (1,500 L)79–84°F (26–29°C)
Spotted boxfish
Ostracion meleagris7.9 in (20 cm)90 gal (340 L)75–81°F (24–27°C)
Spotted Mandarin Dragonet
Synchiropus picturatus2.8 in (7 cm)29 gal (110 L)75–81°F (24–27°C)
Spotted pike characin
Boulengerella maculata13.8 in (35 cm)106 gal (400 L)75–82°F (24–28°C)
Spotted pimelodus
Pimelodus pictus5.5 in (14 cm)55 gal (210 L)72–77°F (22–25°C)
Spotted scat
Scatophagus argus11.8 in (30 cm)119 gal (450 L)72–82°F (22–28°C)
Spotted Unicornfish
Naso brevirostris21.7 in (55 cm)343 gal (1,300 L)75–81°F (24–27°C)
Stinging catfish
Heteropneustes fossilis11.8 in (30 cm)65 gal (245 L)70–77°F (21–25°C)
Streaked prochilodus
Prochilodus lineatus23.6 in (60 cm)396 gal (1,500 L)68–79°F (20–26°C)
Striped eel catfish
Plotosus lineatus12.6 in (32 cm)106 gal (400 L)75–82°F (24–28°C)Sturgeon Catfish
Lamontichthys filamentosus6.3 in (16 cm)36 gal (135 L)72–86°F (22–30°C)
Sultan Pleco (L264)
Leporacanthicus joselimai8.7 in (22 cm)66 gal (250 L)79–86°F (26–30°C)
Sun catfish
Horabagrus brachysoma17.7 in (45 cm)170 gal (645 L)73–77°F (23–25°C)Sunshine Pleco (L014)
Scobinancistrus aureatus13.8 in (35 cm)106 gal (400 L)79–86°F (26–30°C)
Tanganyika killifish
Lamprichthys tanganicanus5.5 in (14 cm)40 gal (150 L)73–77°F (23–25°C)
Threadfin acara
Acarichthys heckelii7.9 in (20 cm)53 gal (200 L)75–86°F (24–30°C)Threadfin cichlid
Petrochromis trewavasae7.1 in (18 cm)159 gal (600 L)75–81°F (24–27°C)Threadfin glassfish
Gymnochanda filamentosa1.6 in (4 cm)16 gal (60 L)73–81°F (23–27°C)
Threespot eartheater
Satanoperca daemon9.8 in (25 cm)119 gal (450 L)79–86°F (26–30°C)
Thunder Royal Pleco (L027)
Panaque armbrusteri17.7 in (45 cm)151 gal (570 L)77–84°F (25–29°C)
Tiger shovelnose catfish
Pseudoplatystoma fasciatum35.4 in (90 cm)300 gal (1,135 L)75–82°F (24–28°C)
Tire-track eel
Mastacembelus armatus27.6 in (70 cm)119 gal (450 L)75–82°F (24–28°C)Transvestite cichlid
Nanochromis transvestitus2.8 in (7 cm)20 gal (75 L)73–81°F (23–27°C)
True parrot cichlid
Hoplarchus psittacus13.8 in (35 cm)151 gal (570 L)79–86°F (26–30°C)Tucano tetra
Tucanoichthys tucano0.8 in (2 cm)12 gal (45 L)75–82°F (24–28°C)Turquoise killifish
Nothobranchius furzeri2.4 in (6 cm)11 gal (40 L)68–79°F (20–26°C)
Twig catfish
Farlowella vittata5.9 in (15 cm)30 gal (115 L)75–81°F (24–27°C)
Twinspot Goby
Signigobius biocellatus3.9 in (10 cm)30 gal (115 L)73–81°F (23–27°C)
Uaru cichlid
Uaru amphiacanthoides11.8 in (30 cm)65 gal (245 L)81–86°F (27–30°C)Uberis betta
Betta uberis1.4 in (3.6 cm)11 gal (40 L)73–81°F (23–27°C)
Undulated triggerfish
Balistapus undulatus11.8 in (30 cm)180 gal (680 L)75–81°F (24–27°C)
Vaillant's Chocolate Gourami
Sphaerichthys vaillanti2.2 in (5.5 cm)20 gal (75 L)70–77°F (21–25°C)Vampire Pleco (L029)
Leporacanthicus galaxias9.8 in (25 cm)66 gal (250 L)79–86°F (26–30°C)
Vampire Tetra
Hydrolycus scomberoides11.8 in (30 cm)185 gal (700 L)75–82°F (24–28°C)
Violet Goby
Gobioides broussonnetii21.7 in (55 cm)119 gal (450 L)72–79°F (22–26°C)
Vulture Catfish
Calophysus macropterus15.7 in (40 cm)120 gal (455 L)75–84°F (24–29°C)
Wallago catfish
Wallago attu59.1 in (150 cm)528 gal (2,000 L)72–82°F (22–28°C)
White-Spotted Cichlid
Tropheus duboisi4.7 in (12 cm)29 gal (110 L)73–82°F (23–28°C)
Wolf cichlid
Parachromis dovii27.6 in (70 cm)250 gal (946 L)75–82°F (24–28°C)
Xingu eartheater
Retroculus xinguensis9.8 in (25 cm)185 gal (700 L)79–86°F (26–30°C)
Yellow Boxfish
Ostracion cubicus17.7 in (45 cm)250 gal (946 L)75–81°F (24–27°C)
Yellow sand cichlid
Xenotilapia flavipinnis3.5 in (9 cm)53 gal (200 L)75–81°F (24–27°C)
Yellow seahorse
Hippocampus kuda7.9 in (20 cm)40 gal (150 L)72–81°F (22–27°C)
Yellowtail Tamarin Wrasse
Anampses meleagrides8.7 in (22 cm)90 gal (340 L)73–81°F (23–27°C)Zebra shovelnose
Brachyplatystoma tigrinum23.6 in (60 cm)151 gal (570 L)72–90°F (22–32°C)Zorro Catfish
Platystomatichthys sturio15.7 in (40 cm)120 gal (455 L)75–82°F (24–28°C)
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