Betta tank mates

Bettas are slow, long-finned and territorial. Good tank mates stay out of their way: bottom dwellers, small calm schools and algae eaters, never fin nippers or other long-finned fish.

Each species is checked against bettas both ways: mouth size, fin nipping, temperament, territory, water overlap and keeper reports.

Good tank mates

Harlequin rasbora
Trigonostigma heteromorpha
Fits
Copper-orange schooling fish with a black wedge; hardy, calm and a good first school for a 15–20 gallon tank.
1.4 in · 17+ gal · 73–81°F · pH 6–7
Panda corydoras
Corydoras panda
Fits
Friendly armoured catfish that sift the sand in groups; need soft substrate and a group of six or more.
1.6 in · 17+ gal · 72–77°F · pH 6–7.2
Otocinclus
Otocinclus vittatus
Fits
Tiny algae grazers for mature planted tanks; keep six or more and supplement with vegetables.
1.4 in · 17+ gal · 72–79°F · pH 6–7.2
Black neon tetra
Hyphessobrycon herbertaxelrodi
Fits
A peaceful tetra with a bright white-over-black stripe; hardier than the neon tetra and an easy fit in any calm community tank.
1.4 in · 23+ gal · 73–81°F · pH 5.5–7.5
Blood parrot cichlid
hybrid
Fits
A man-made hybrid cichlid with a round body and a beak-like mouth that barely closes; usually gentle and rarely able to swallow tank mates.
7.9 in · 36+ gal · 72–82°F · pH 6.5–8
Bristlenose pleco
Ancistrus cf. cirrhosus
Fits
The go-to glass cleaner: a compact 5-inch pleco with bushy whiskers on the males that needs a cave and vegetables, not just algae.
4.9 in · 17+ gal · 70–79°F · pH 5.5–7.5
Bronze cory
Corydoras aeneus
Fits
The most widely kept cory: a tough bronze-green or albino catfish that shoals along the bottom and handles a broad range of water.
3 in · 23+ gal · 70–81°F · pH 6–8
Cardinal tetra
Paracheirodon axelrodi
Fits
The neon's close cousin, with red running the full length of the belly; a soft, acidic-water schooling fish that likes it warmer than neons.
1.4 in · 17+ gal · 73–81°F · pH 4–6
Cherry barb
Puntius titteya
Fits
One of the most peaceful barbs: males glow cherry red and leave fins alone, making it great for planted community tanks.
2 in · 17+ gal · 73–81°F · pH 6–8
Clown loach
Chromobotia macracanthus
Fits
A bold orange-and-black loach that lives 20 years and grows over a foot long, so a proper group needs a 6-foot tank.
15.7 in · 202+ gal · 75–86°F · pH 5–7
Common pleco
Pterygoplichthys pardalis
Fits
The classic store 'algae eater' that grows to nearly two feet, fouls the water and eats less algae with age; a fish for very large tanks only.
22.8 in · 203+ gal · 77–82°F · pH 7–7.5
Demasoni
Chindongo demasoni (syn. Pseudotropheus demasoni)
Fits
A small blue-and-black striped mbuna with outsized aggression; it attacks much larger fish and is kept only in large, crowded groups.
3 in · 64+ gal · 75–82°F · pH 8.2–8.5
Discus
Symphysodon aequifasciatus (species complex)
Fits
The 'king of the aquarium': a disc-shaped Amazon cichlid in countless bred colours that needs warm, soft, very clean water.
5.5 in · 80+ gal · 79–86°F · pH 5–7
Fairy cichlid
Neolamprologus brichardi
Fits
A graceful Tanganyika cichlid with a lyre tail; one pair grows into a family colony that guards its rocks year-round.
3.5 in · 34+ gal · 73–79°F · pH 8–9
Firemouth cichlid
Thorichthys meeki
Fits
A Central American cichlid with a fiery red throat it flares when threatened; fairly calm for a cichlid but territorial when breeding.
4.7 in · 34+ gal · 75–82°F · pH 6.5–8.5
Glowlight tetra
Hemigrammus erythrozonus
Fits
A small, translucent tetra with a glowing orange stripe along its body; peaceful, hardy and at its best in a densely planted tank.
1.6 in · 22+ gal · 75–82°F · pH 6–7.5
Golden mbuna
Melanochromis auratus
Fits
A striped gold mbuna and one of the most aggressive Malawi cichlids; it kills rival males, so plan a crowded harem tank of 55 gallons or more.
4.3 in · 64+ gal · 75–82°F · pH 7.6–8.8
Kribensis
Pelvicachromis pulcher
Fits
A small West African cichlid whose female has a bright belly; a cave-spawning pair digs pits and guards fry along the bottom.
3.9 in · 23+ gal · 75–81°F · pH 6.5–7
Kuhli loach
Pangio semicincta
Fits
A banded, eel-like loach of about 4 inches that burrows by day and explores the bottom as a group in the evening; needs soft sand.
3.9 in · 17+ gal · 70–79°F · pH 3.5–7
Leopard sailfin pleco
Pterygoplichthys gibbiceps
Fits
A tall-finned pleco with a brocade pattern that is sold at 2 inches and grows to about 20, needing a very large tank and heavy filtration.
19.7 in · 187+ gal · 77–86°F · pH 5–7
Molly
Poecilia sphenops
Fits
A sturdy livebearer that needs hard water and plenty of plant food, and does well in slightly brackish conditions.
3.1 in · 26+ gal · 70–82°F · pH 7–8.5
Multies
Neolamprologus multifasciatus
Fits
The smallest Tanganyika cichlid, about 2 inches, living in empty snail shells; a colony carves the sand into tiny fiercely guarded plots.
1.8 in · 13+ gal · 77–80°F · pH 8–8.5
Peacock cichlid
Aulonocara jacobfreibergi
Fits
The peacocks of Lake Malawi: brilliant males, grey females, calmer than mbuna and gentle with plants, but they need fine sand to feed.
6.7 in · 135+ gal · 77–84°F · pH 7.5–9
Peppered cory
Corydoras paleatus
Fits
One of the hardiest corys: a mottled catfish that sifts sand in a group of six and prefers slightly cooler water.
2.8 in · 22+ gal · 72–79°F · pH 6–7

And 59 more in the species catalog.

Risky

And 8 more in the species catalog.

Avoid

And 34 more in the species catalog.

Questions

Can bettas live with guppies?

Usually not: a betta reads a guppy's long, colourful tail as a rival and attacks it.

What size tank does a betta need for tank mates?

Ten gallons for a few shrimp or snails, 20 gallons for a small school or corydoras.

Every tank is different. Set yours up once (size, water, who already lives there) and each species is checked against it.

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