ParrotCichlid
- #1
I've seen the question come up on here fairly often, what aggressive fish can I keep in my 20 gallon tank? Can I keep Piranhas in a 30 gallon tank? Well this compilation of oddballs, unique and aggressive fish should help answer them questions. I have compiled this list for people who want something unusual or even a minI monster for their aquarium of 5-50g in volume.
You should find something on this list that matches what you are looking for. It includes everything from Piranhas to Snakehead species and Gar like fish.
If the fish species is marked as Medium or Difficult this means that it is really only suitable for experienced aquarists or people who can put a significant amount of research into meeting the specific species needs.
The list is in the following format.
Scientific Name | Common Name | Care Level | Size | Tank Size
Luciocephalus aura | Peppermint Crocodile Fish | Difficult | 5" | 30 gallon Tank
Belonesox belizanus | Pike Livebearer | Easy | Males 5" Females 8" | 40 gallon Breeder
Ctenolucius hujeta | Rocket Gar | Medium | 10" | 50-75g Tank
Xenentodon cancila | Needle Nose Gar | Medium | 12-14" | 50-75g Tank
Butis Butis | Crocodile Fish | Easy | 5.5" | 30 gallon Tank
Dermogenys pusilla | Wrestling Halfbeak | Medium | 1.25"-2.75" | 20 gallon Tank
Exodon paradoxus | Bucktoothed Tetra | Easy | 4-6" | 30 gallon Tank
Serrasalmus sanchezI | Red Throat Piranha | Medium | 7" | 40 gallon Breeder
Catoprion mento | Wimple Piranha | Medium | 3-5" | 20 gallon Tank
Pristobrycon calmonI | Dusky Piranha | Difficult | 5.9" | 50 gallon Tank
Serrasalmus Irritans | Irritan Piranha | Difficult | 5.9" | 50 gallon Tank
Archocentrus sajica | Sajica Cichlid | Easy | 6" | 40 gallon Breeder
Cichlasoma Octofasciatum | Jack Dempsey | Easy | 8" | 50 gallon Tank
Anomalochromis thomasI | Juwel Cichlid | Easy | 2.8" Males 4" Females | 20 gallon Tank
Pelvicachromis pulcher | Kribensis Cichlid | Easy | 4" | 10 gallon Tank
Apistogramma | Dwarf Cichlids | Medium | 1-4.5" | 20 gallon Tank
Crenicichla Compressiceps | Dwarf Pike Cichlid | Medium | 3-5" | 20 gallon Tank
Altolamprologus compressiceps | Compressiceps Cichlid | Medium | Males 5" Females 3.3" | 20 gallon Tank
Lamprologus ocellatus | Tanganyikan Shell Dweller | Easy | 1" | 5 gallon Tank
Pyxichromis orthostoma | NA Cichlid | Easy | 8" | 50 gallon Tank
Neolamprologus brichardI | Brichard's Lyretail Cichlid | Easy | 3-5" | 30 gallon Tank
Cichlasoma salvini, Nandopsis salvinI | SalvinI Cichlid | Medium | 6" | 40 gallon Breeder
Archocentrus nigrofasciatus | Black Convict | Easy | 6" | 29 gallon Tank
Crenicichla saxatilis | Dwarf Spangled Pike Cichlid | Medium | 10" | 50-75g Tank
Aequidens rivulatus | Green Terror Cichlid | Medium | Males 12" Females 8" | 50-75g Tank
Thalassophryne Amazonica | Prehistoric Monster Fish | Medium | 4-6" | 20 gallon Tank
Betta Albimarginata | Whiteseam Fighter | Difficult | 2" | 15 gallon Tank
Erythrinus erythrinus | Rainbow Wolf fish | Easy | 8" | 40 gallon Tank
Pantodon buchholzI | African Butterfly Fish | Easy | 5" | 20 gallon Tank
Monocirrhus polyacanthus | South American Leaf Fish | Medium | 3" | 20 gallon Tank
Polypterus senegalus | Senegal Bichir | Easy | 12-14" | 50 gallon Tank
Polypterus mokelembembe | Moke Bichir | Medium | 12-14" | 55 gallon Tank
Polypterus Palmas palmas | Marbled Bichir | Easy | 12" | 50 gallon Tank
Pimelodus Pictus | Pictus Catfish | Medium | 5" | 30 gallon Tank
Macrognathus Siamensis | Peacock Spiny Eel | Easy | 11" | 30 gallon Tank
Apteronotus albifrons | Black Ghost Knifefish | Medium | 12-14" | 50 gallon grow out 75 gallon Adult
Xenomystus nigrI | African Brown Knifefish | Medium | 12" | 50 gallon tank
Esox Americanus Americanus | Redfin Pickerel | Medium | 7-8" | 40 gallon Breeder
Acantharchus pomotis | Mud Sunfish | Easy | 8" | 40 gallon Tank
Chanda ranga | Indian Glass Fish | Medium | 3" | 20 gallon Tank
Nandus Nandus | Marble Dat | Easy | 6" | 30 gallon tank
Asterophysus batrachus | Gulper Catfish | Easy | 10" | 50 gallon Tank
Lebiasina astrigata | Colombian Dwarf Predatory Tetra | Medium | 3.5" | 30 gallon Tank
Channa gachua | Dwarf Snakehead | Easy | 7.8" | 50 gallon Tank
Channa bleherI | Rainbow Snakehead | Easy | 7.8" | 50 gallon Tank
Channa bankanensis | Banka snakehead | Medium | 9" | 50 gallon Tank
Channa punctata | Spotted Snakehead | Easy | 12" | 50-75g Tank
Chaca chaca | Frogmouth catfish | Easy | 7.1" | 40 gallon Breeder
Tetraodon Miurus | Congo Puffer | Medium | 6" | 40 gallon Breeder
Tetraodon biocellatus | Figure 8 Puffer | Medium | 3" | 20 gallon Tank
Carinotetraodon travancoricus | Dwarf Puffer | Easy | 1.5" | 5 gallon Tank
Carinotetraodon lorteti, salivator, borneensis, irrubesco | Red Eye Puffer | Medium | 1.8" | 20 gallon Tank
Colomesus asellus | Amazon Puffer | Medium | 3.1" | 40 gallon Breeder
Tetraodon turgidus/Pao turgidus | Target Puffer | Medium | 6" | 40 gallon Breeder
Cottus bairdI | Mottled Sculpin | Medium | 3-4" | 10 gallon Tank
Crenicichla minuano | Minuano | Easy | 6" | 40 gallon Breeder
Periophthalmus barbarus | african mudskipper | Medium | 5-6" | 20 gallon Tank
Bunocephalus coracoideus | Banjo Catfish | Easy | 6" | 20 gallon tank
Abramites hypselonotus | Marbled headstander | Easy | 5.5" | 30 gallon tank
Cetopsis coecutiens | Torpedo Whale Catfish | Easy | 6" | 40 gallon Breeder
Enneacampus ansorgiI | African Freshwater Pipefish | Hard | 6" | 20 gallon Tank
Allenbatrachus grunniens | Freshwater Toadfish | Medium | 12" | 50 gallon Tank
Polycentropsis abbreviata | African Leaf Fish | Medium | 3" | 20 gallon Tank
Achirus lineatus | Freshwater Flounder | Medium | 4.7" | 20 gallon Tank
Pseudomystus siamensis | Siamese Barred Catfish | Medium | 7" | 40 gallon Breeder
Centromochlus perugiae | Leopard tatia | Medium | 2.5" | 20 gallon Tank
Cottus bairdiI | Mottled Sculpin | Medium | 5" | 20 gallon Tank
Devario aequipinnatus | Giant Danio | Easy | 4.5" | 40 gallon Breeder
Ageneiosus sp. cf. vittatus | Striped Ageneiosus | Medium | 8" | 50 gallon Tank
Synodontis petricola | Cukoo Catfish | Easy | 3.5" | 30 gallon Tank
Platydoras costatus | Spotted Rafael Catfish | Easy | 4-8" | 20-40g Tank
N. depressifrons | Butterfly Goby | Difficult | 4" | 30 gallon Tank
Rhinogobius Candidianus | Candidius Goby | Medium | 4" | 10 gallon Tank
Brachygobius xanthomelas, Brachygobius doriae | Bumblebee Goby | Medium | 1.5" | 5 gallon Tank
Stigmatogobius sadanunidio | Knight Goby | Easy | 3" | 20 gallon tank
Liosomadoras oncinus | Jaguar Catfish | Difficult | 7" | 50 gallon Tank
Lepidiolamprologus HequI | HequI | Medium | 3.5" | 20 gallon Tank
Microctenopoma nanum | Dwarf Climbing Perch | Medium | 3" | 20 gallon Tank
Ctenopoma acutirostre | Leopard Bush Fish | Easy | 6" | 30 gallon Tank
Astyanax jordanI | Blind Cave Fish | Easy | 4" | 20 gallon Tank
Sphaerichthys osphromenoides | Chocolate Gourami | Difficult | 2.3" | 15 gallon Tank
Lepomis megalotis | Longear Sunfish | Easy | 5-8" | 30-50g Tank
Typhlonectes natans | Rubber Eel | Medium | 19" | 50 gallon Tank
Pollimyrus castelnauI | Dwarf Stonebasher | Difficult | 3" | 30 gallon Tank
Fundulopanchax sjoestedtI | Blue Gularis | Medium | 5.9" | 20 gallon Tank
Etheostoma blennoides | Greenside Darter | Difficult | 4-6" | 20 gallon Tank
Crenuchus spilurus GÜNTHER | Sailfin Characin | Medium | 2.7" | 20 gallon Tank
Saltwater
Ichthyomyzon unicuspis | Silver Lamprey | Medium | 8" | 40 gallon Breeder
Antennarius maculatus | Warty Frogfish | Easy | 8" | 30 gallon Tank
Odontodactylus scyllarus | Peacock Mantis Shrimp | Medium | 8" | 20 gallon Tank
Nudibranchs | Difficult | 5-12" | 10-100g Tank
You should find something on this list that matches what you are looking for. It includes everything from Piranhas to Snakehead species and Gar like fish.
If the fish species is marked as Medium or Difficult this means that it is really only suitable for experienced aquarists or people who can put a significant amount of research into meeting the specific species needs.
The list is in the following format.
Scientific Name | Common Name | Care Level | Size | Tank Size
Luciocephalus aura | Peppermint Crocodile Fish | Difficult | 5" | 30 gallon Tank
Belonesox belizanus | Pike Livebearer | Easy | Males 5" Females 8" | 40 gallon Breeder
Ctenolucius hujeta | Rocket Gar | Medium | 10" | 50-75g Tank
Xenentodon cancila | Needle Nose Gar | Medium | 12-14" | 50-75g Tank
Butis Butis | Crocodile Fish | Easy | 5.5" | 30 gallon Tank
Dermogenys pusilla | Wrestling Halfbeak | Medium | 1.25"-2.75" | 20 gallon Tank
Exodon paradoxus | Bucktoothed Tetra | Easy | 4-6" | 30 gallon Tank
Serrasalmus sanchezI | Red Throat Piranha | Medium | 7" | 40 gallon Breeder
Catoprion mento | Wimple Piranha | Medium | 3-5" | 20 gallon Tank
Pristobrycon calmonI | Dusky Piranha | Difficult | 5.9" | 50 gallon Tank
Serrasalmus Irritans | Irritan Piranha | Difficult | 5.9" | 50 gallon Tank
Archocentrus sajica | Sajica Cichlid | Easy | 6" | 40 gallon Breeder
Cichlasoma Octofasciatum | Jack Dempsey | Easy | 8" | 50 gallon Tank
Anomalochromis thomasI | Juwel Cichlid | Easy | 2.8" Males 4" Females | 20 gallon Tank
Pelvicachromis pulcher | Kribensis Cichlid | Easy | 4" | 10 gallon Tank
Apistogramma | Dwarf Cichlids | Medium | 1-4.5" | 20 gallon Tank
Crenicichla Compressiceps | Dwarf Pike Cichlid | Medium | 3-5" | 20 gallon Tank
Altolamprologus compressiceps | Compressiceps Cichlid | Medium | Males 5" Females 3.3" | 20 gallon Tank
Lamprologus ocellatus | Tanganyikan Shell Dweller | Easy | 1" | 5 gallon Tank
Pyxichromis orthostoma | NA Cichlid | Easy | 8" | 50 gallon Tank
Neolamprologus brichardI | Brichard's Lyretail Cichlid | Easy | 3-5" | 30 gallon Tank
Cichlasoma salvini, Nandopsis salvinI | SalvinI Cichlid | Medium | 6" | 40 gallon Breeder
Archocentrus nigrofasciatus | Black Convict | Easy | 6" | 29 gallon Tank
Crenicichla saxatilis | Dwarf Spangled Pike Cichlid | Medium | 10" | 50-75g Tank
Aequidens rivulatus | Green Terror Cichlid | Medium | Males 12" Females 8" | 50-75g Tank
Thalassophryne Amazonica | Prehistoric Monster Fish | Medium | 4-6" | 20 gallon Tank
Betta Albimarginata | Whiteseam Fighter | Difficult | 2" | 15 gallon Tank
Erythrinus erythrinus | Rainbow Wolf fish | Easy | 8" | 40 gallon Tank
Pantodon buchholzI | African Butterfly Fish | Easy | 5" | 20 gallon Tank
Monocirrhus polyacanthus | South American Leaf Fish | Medium | 3" | 20 gallon Tank
Polypterus senegalus | Senegal Bichir | Easy | 12-14" | 50 gallon Tank
Polypterus mokelembembe | Moke Bichir | Medium | 12-14" | 55 gallon Tank
Polypterus Palmas palmas | Marbled Bichir | Easy | 12" | 50 gallon Tank
Pimelodus Pictus | Pictus Catfish | Medium | 5" | 30 gallon Tank
Macrognathus Siamensis | Peacock Spiny Eel | Easy | 11" | 30 gallon Tank
Apteronotus albifrons | Black Ghost Knifefish | Medium | 12-14" | 50 gallon grow out 75 gallon Adult
Xenomystus nigrI | African Brown Knifefish | Medium | 12" | 50 gallon tank
Esox Americanus Americanus | Redfin Pickerel | Medium | 7-8" | 40 gallon Breeder
Acantharchus pomotis | Mud Sunfish | Easy | 8" | 40 gallon Tank
Chanda ranga | Indian Glass Fish | Medium | 3" | 20 gallon Tank
Nandus Nandus | Marble Dat | Easy | 6" | 30 gallon tank
Asterophysus batrachus | Gulper Catfish | Easy | 10" | 50 gallon Tank
Lebiasina astrigata | Colombian Dwarf Predatory Tetra | Medium | 3.5" | 30 gallon Tank
Channa gachua | Dwarf Snakehead | Easy | 7.8" | 50 gallon Tank
Channa bleherI | Rainbow Snakehead | Easy | 7.8" | 50 gallon Tank
Channa bankanensis | Banka snakehead | Medium | 9" | 50 gallon Tank
Channa punctata | Spotted Snakehead | Easy | 12" | 50-75g Tank
Chaca chaca | Frogmouth catfish | Easy | 7.1" | 40 gallon Breeder
Tetraodon Miurus | Congo Puffer | Medium | 6" | 40 gallon Breeder
Tetraodon biocellatus | Figure 8 Puffer | Medium | 3" | 20 gallon Tank
Carinotetraodon travancoricus | Dwarf Puffer | Easy | 1.5" | 5 gallon Tank
Carinotetraodon lorteti, salivator, borneensis, irrubesco | Red Eye Puffer | Medium | 1.8" | 20 gallon Tank
Colomesus asellus | Amazon Puffer | Medium | 3.1" | 40 gallon Breeder
Tetraodon turgidus/Pao turgidus | Target Puffer | Medium | 6" | 40 gallon Breeder
Cottus bairdI | Mottled Sculpin | Medium | 3-4" | 10 gallon Tank
Crenicichla minuano | Minuano | Easy | 6" | 40 gallon Breeder
Periophthalmus barbarus | african mudskipper | Medium | 5-6" | 20 gallon Tank
Bunocephalus coracoideus | Banjo Catfish | Easy | 6" | 20 gallon tank
Abramites hypselonotus | Marbled headstander | Easy | 5.5" | 30 gallon tank
Cetopsis coecutiens | Torpedo Whale Catfish | Easy | 6" | 40 gallon Breeder
Enneacampus ansorgiI | African Freshwater Pipefish | Hard | 6" | 20 gallon Tank
Allenbatrachus grunniens | Freshwater Toadfish | Medium | 12" | 50 gallon Tank
Polycentropsis abbreviata | African Leaf Fish | Medium | 3" | 20 gallon Tank
Achirus lineatus | Freshwater Flounder | Medium | 4.7" | 20 gallon Tank
Pseudomystus siamensis | Siamese Barred Catfish | Medium | 7" | 40 gallon Breeder
Centromochlus perugiae | Leopard tatia | Medium | 2.5" | 20 gallon Tank
Cottus bairdiI | Mottled Sculpin | Medium | 5" | 20 gallon Tank
Devario aequipinnatus | Giant Danio | Easy | 4.5" | 40 gallon Breeder
Ageneiosus sp. cf. vittatus | Striped Ageneiosus | Medium | 8" | 50 gallon Tank
Synodontis petricola | Cukoo Catfish | Easy | 3.5" | 30 gallon Tank
Platydoras costatus | Spotted Rafael Catfish | Easy | 4-8" | 20-40g Tank
N. depressifrons | Butterfly Goby | Difficult | 4" | 30 gallon Tank
Rhinogobius Candidianus | Candidius Goby | Medium | 4" | 10 gallon Tank
Brachygobius xanthomelas, Brachygobius doriae | Bumblebee Goby | Medium | 1.5" | 5 gallon Tank
Stigmatogobius sadanunidio | Knight Goby | Easy | 3" | 20 gallon tank
Liosomadoras oncinus | Jaguar Catfish | Difficult | 7" | 50 gallon Tank
Lepidiolamprologus HequI | HequI | Medium | 3.5" | 20 gallon Tank
Microctenopoma nanum | Dwarf Climbing Perch | Medium | 3" | 20 gallon Tank
Ctenopoma acutirostre | Leopard Bush Fish | Easy | 6" | 30 gallon Tank
Astyanax jordanI | Blind Cave Fish | Easy | 4" | 20 gallon Tank
Sphaerichthys osphromenoides | Chocolate Gourami | Difficult | 2.3" | 15 gallon Tank
Lepomis megalotis | Longear Sunfish | Easy | 5-8" | 30-50g Tank
Typhlonectes natans | Rubber Eel | Medium | 19" | 50 gallon Tank
Pollimyrus castelnauI | Dwarf Stonebasher | Difficult | 3" | 30 gallon Tank
Fundulopanchax sjoestedtI | Blue Gularis | Medium | 5.9" | 20 gallon Tank
Etheostoma blennoides | Greenside Darter | Difficult | 4-6" | 20 gallon Tank
Crenuchus spilurus GÜNTHER | Sailfin Characin | Medium | 2.7" | 20 gallon Tank
Saltwater
Ichthyomyzon unicuspis | Silver Lamprey | Medium | 8" | 40 gallon Breeder
Antennarius maculatus | Warty Frogfish | Easy | 8" | 30 gallon Tank
Odontodactylus scyllarus | Peacock Mantis Shrimp | Medium | 8" | 20 gallon Tank
Nudibranchs | Difficult | 5-12" | 10-100g Tank