New Guinea Rainbowfish & Betta Macrostoma
Melanotaenia affinis · Betta macrostoma
New Guinea Rainbowfish: PeacefulBetta Macrostoma: Semi-Aggressive
Back to all fishesView full care guide
New Guinea Rainbowfish Tank Mates & Compatibility
New Guinea Rainbowfish
Melanotaenia affinis
TemperamentPeaceful (2/10)
Adult Size11.5 cm
Temperature22–28°C
Water TypeFreshwater Only
Swim ZoneMid-level, Surface
StockingSchool of 6+
Showing 97 - 120 of 735 Tank Mates
Not Recommended
New Guinea Rainbowfish & Betta Smaragdina
Melanotaenia affinis · Betta smaragdina
New Guinea Rainbowfish: PeacefulBetta Smaragdina: Semi-Aggressive
New Guinea Rainbowfish & Black Acara
Melanotaenia affinis · Cichlasoma bimaculatum
New Guinea Rainbowfish: PeacefulBlack Acara: Semi-Aggressive
New Guinea Rainbowfish & Black Belt Cichlid
Melanotaenia affinis · Vieja maculicauda
New Guinea Rainbowfish: PeacefulBlack Belt Cichlid: Aggressive
New Guinea Rainbowfish & Black Bullhead Catfish
Melanotaenia affinis · Ameiurus melas
New Guinea Rainbowfish: PeacefulBlack Bullhead Catfish: Aggressive
New Guinea Rainbowfish & Black Corydoras
Melanotaenia affinis · Corydoras schultzei
New Guinea Rainbowfish: PeacefulBlack Corydoras: Peaceful
New Guinea Rainbowfish & Black Diamond Cichlid
Melanotaenia affinis · Paratilapia polleni
New Guinea Rainbowfish: PeacefulBlack Diamond Cichlid: Aggressive
New Guinea Rainbowfish & Black Fin Cory
Melanotaenia affinis · Corydoras leucomelas
New Guinea Rainbowfish: PeacefulBlack Fin Cory: Peaceful
New Guinea Rainbowfish & Black Ghost Knifefish
Melanotaenia affinis · Apteronotus albifrons
New Guinea Rainbowfish: PeacefulBlack Ghost Knifefish: Semi-Aggressive
New Guinea Rainbowfish & Black Kuhli Loach
Melanotaenia affinis · Pangio oblonga
New Guinea Rainbowfish: PeacefulBlack Kuhli Loach: Peaceful
New Guinea Rainbowfish & Black Marble Hoplo
Melanotaenia affinis · Megalechis thoracata
New Guinea Rainbowfish: PeacefulBlack Marble Hoplo: Mostly Peaceful
New Guinea Rainbowfish & Black Neon Tetra
Melanotaenia affinis · Hyphessobrycon herbertaxelrodi
New Guinea Rainbowfish: PeacefulBlack Neon Tetra: Peaceful
New Guinea Rainbowfish & Black Ocellatus
Melanotaenia affinis · Lamprologus speciosus
New Guinea Rainbowfish: PeacefulBlack Ocellatus: Aggressive
New Guinea Rainbowfish & Black Pacu
Melanotaenia affinis · Colossoma macropomum
New Guinea Rainbowfish: PeacefulBlack Pacu: Mostly Peaceful
New Guinea Rainbowfish & Black Phantom Tetra
Melanotaenia affinis · Hyphessobrycon megalopterus
New Guinea Rainbowfish: PeacefulBlack Phantom Tetra: Peaceful
New Guinea Rainbowfish & Black Ruby Barb
Melanotaenia affinis · Pethia nigrofasciata
New Guinea Rainbowfish: PeacefulBlack Ruby Barb: Mostly Peaceful
New Guinea Rainbowfish & Black Skirt Tetra
Melanotaenia affinis · Gymnocorymbus ternetzi
New Guinea Rainbowfish: PeacefulBlack Skirt Tetra: Mostly Peaceful
New Guinea Rainbowfish & Black-Banded Rainbowfish
Melanotaenia affinis · Melanotaenia nigrans
New Guinea Rainbowfish: PeacefulBlack-Banded Rainbowfish: Peaceful
New Guinea Rainbowfish & Blackline Rasbora
Melanotaenia affinis · Rasbora borapetensis
New Guinea Rainbowfish: PeacefulBlackline Rasbora: Peaceful
New Guinea Rainbowfish & Bladder Snail (Pest Snail)
Melanotaenia affinis · Physella acuta
New Guinea Rainbowfish: PeacefulBladder Snail (Pest Snail): Peaceful
New Guinea Rainbowfish & Bleeding Heart Tetra
Melanotaenia affinis · Hyphessobrycon erythrostigma
New Guinea Rainbowfish: PeacefulBleeding Heart Tetra: Peaceful
New Guinea Rainbowfish & Bleher's Rainbowfish
Melanotaenia affinis · Chilatherina bleheri
New Guinea Rainbowfish: PeacefulBleher's Rainbowfish: Peaceful
New Guinea Rainbowfish & Blind Cave Tetra
Melanotaenia affinis · Astyanax mexicanus
New Guinea Rainbowfish: PeacefulBlind Cave Tetra: Mostly Peaceful
New Guinea Rainbowfish & Blood Parrot Cichlid
Melanotaenia affinis · Hybrid cichlid (Blood Parrot)
New Guinea Rainbowfish: PeacefulBlood Parrot Cichlid: Semi-Aggressive