Possible Compatible Species for Gnathonemus petersii
Note: This is a rule based search which makes certain assumptions based on characteristics including size, temperament, temperature and pH. As with all advice, please use common sense before combining any two species.
| Scientific Name | Common Names | Synonyms | Family | |
| Serrasalmus rhombeus | Black Piranha Niger Piranha Rhom Piranha White Piranha | Serralamus niger | Characidae | |
| Archocentrus spinosissimus | Spiney Cichlid Spinner Cichlid Spinos Cichlid | Cichlasoma immaculata Cichlasoma spinosissimum immaculata Cichlasoma spinosissimus Heros spinosissimus | Cichlidae | |
 | Petenia splendida | Red Bay Snook Red Snook | Cichlidae | |
 | Notopterus chitala | Clown Featherback Clown Featherfin Clown Knife Clown Knifefish | Chitara ornata Notopterus buchanani Notopterus ocellifer Notopterus ornatus | Notopteridae |
 | Hemichromis lifalili | Blood Red Jewel | Cichlidae | |
 | Epalzeorhynchos bicolor | Red Tailed Black Shark Redtail Shark | Labeo bicolor | Cyprinidae |
| Leporacanthicus joselimai | Leopard Leporacanthicus Sultan Pleco | Loricariidae | ||
| Tetraodon mbu | Giant Puffer Mbu Puffer | Tetrodon mbu | Tetraodontidae | |
 | Epalzeorhynchos frenatum | Rainbow Shark Redfin Shark | Labeo frenatus | Cyprinidae |
| Tetraodon suvatii | Arrowhead Puffer Hognose Puffer Mekong Puffer Pignose Puffer | Monotrette suvatii | Tetraodontidae | |
 | Colomesus asellus | Amazon Puffer South American Puffer | Tetraodontidae | |
 | Thorichthys helleri | Heller's Cichlid | Astronotus helleri Cichlasoma champotone Cichlasoma champotonis Cichlasoma helleri Herichthys helleri Heros helleri | Cichlidae |
 | Cryptoheros sp. 'honduran red point' | Blue Convict Honduran Red Fin Honduran Red Point | Cichlidae | |
 | Amphilophus festae | Guayas Cichlid Harlequin Cichlid Red Terror | Amphilophus festae Herichthys festae Heros festae Nandopsis festae | Cichlidae |
 | Scleropages jardinii | Australian Pearl Arowana Gulf Saratoga Jardini Northen Saratoga Northern Spotted Barramundi Saratoga | Osteoglossidae | |
 | Butis butis | Crazy Fish Duckbill Sleeper | Cheilodipterus butis Eleotris butis | Eleotridae |
 | Steatocranus casuarius | African Blockhead Buffalo Head Cichlid Humphead Lionhead Cichlid | Cichlidae | |
 | Gnathonemus petersii | Elephantnose Peter's elephantnose | Mormyrus petersii | Mormyridae |
 | Melanotaenia goldiei | Goldie River Rainbowfish | Aristeus goldiei | Melanotaeniidae |
 | Amphilophus labiatus | Red Devil | Cichlasoma labiatum Herichthys labiatus Heros labiatus | Cichlidae |
| Ctenolucius hujeta | Freshwater Barracuda Gar Characin Hujeta Pike Characin Rocket Gar | Ctenolucius hujeta hujeta Hydrocynus hujeta Luciocharax hujeta Xiphostoma hujeta | Ctenoluciidae | |
 | Leptobarbus hoevenii | Cigar Shark Mad Barb | Barbus hoevenii | Cyprinidae |
 | Tetraodon lineatus | Fahaka Puffer Globe Fish Nile Puffer | Tetraodon fahaka Tetraodon lineatus lineatus Tetrodon strigosus | Tetraodontidae |
 | Macrognathus aculeatus | Lesser Spiny Eel Peacock Eel Spiny Eel | Mastacembelus aculeatus Ophidium aculeatum Rhyncobdella aculeata | Mastacembelidae |
 | Astronotus ocellatus | Oscar | Lobotes ocellatus | Cichlidae |
 | Amphilophus citrinellus | Midas Cichlid | Amphilophus citrinellum Archocentrus citrinellus Cichlasoma citrinella Cichlasoma citrinellum Herichthys citrinellus Heros citrinellus | Cichlidae |
 | Labeo chrysophekadion | Black Labeo Black Shark Black Sharkminnow | Morulius chrysophekadion Rohita chrysophekadion | Cyprinidae |
 | Thorichthys meeki | Firemouth Cichlid | Cichlasoma hyorhynchum Cichlasoma meeki Herichthys meeki Heros meeki Thorichthys helleri meeki Thorichthys meeki | Cichlidae |
 | Altolamprologus compressiceps | Compressed Cichlid | Lamprologus compressiceps Neolamprologus compressiceps | Cichlidae |
 | Helostoma temminckii | Kissing Gourami | Helostomatidae | |
 | Trichogaster trichopterus | Blue Gourami Crosby Gourami Golden Gourami Opaline Gourami Three Spot Gourami Two Spot Gourami | Labrus trichopterus Trichopodus trichopterus Trichopus trichopterus | Osphronemidae |
| Amphilophus trimaculatum | Three Spot Cichlid Trimac Cichlid | Three-spot Cichlid | Cichlidae | |
| Ctenopoma acutirostre | Leopard Ctenopoma Spotted Bushfish Spotted Climbing Perch | Anabantidae | ||
 | Baryancistrus sp. LDA33 | Big White Spot, White Spot, LDA33/L 142, Snowball Pleco | Loricariidae | |
| Abramites hypselonotus | High-Backed Headstander Marbled Headstander | Abramites microcephalus Abramites ternetzi Leporinus nigripinnis Leporinus solarii | Anostomidae | |
| Potamotrygon motoro | Motoro Stingray Ocellated River Stingray Spotted River Ray | Potamotrygonidae |