Species › Danios, rasboras and minnows

Harlequin rasbora tank mates and minimum tank size

Trigonostigma heteromorpha

Harlequin rasboras grow to 5 cm (2 in). They live in groups: keep at least 10. They need 22–25 °C (72–77 °F) and pH 5.0–7.0.

Minimum tank

54 L (14 US gal), at least 60 cm (24 in) long

Adult size

5 cm (2 in)

Temperature

22–25 °C (72–77 °F)

pH

pH 5.0–7.0

Group

10 or more

Harlequin rasbora minimum tank size

Harlequin rasboras need at least 54 L (14 US gal), in a tank at least 60 cm (24 in) long.

That is the largest minimum among the sources below. The planner also checks the tank length against the adult size of 5 cm (2 in): a tank shorter than 4 times that is cramped (20 cm (7.9 in)).

Harlequin rasbora tank mates

Each of the other 52 species in this reference, judged against harlequin rasboras by the same rules as the compatibility checker. A guide, not a guarantee.

Compatible (27)

• Black neon tetra
• Black skirt tetra
• Bristlenose pleco
• Cardinal tetra
• Celestial pearl danio
• Cherry barb
• Congo tetra
• Ember tetra
• Glass catfish
• Glowlight tetra
• Honey gourami
• Kribensis
• Kuhli loach
• Lemon tetra
• Neon tetra
• Otocinclus
• Panda corydoras
• Pearl gourami
• Peppered corydoras
• Pygmy corydoras
• Red tail shark
• Rummy-nose tetra
• Serpae tetra
• Siamese algae eater
• Tiger barb
• Yoyo loach
• Zebra danio

With care (16)

• BettaThe only temperature that suits both is 24.4–25 °C (76–77 °F), set by bettas and harlequin rasboras. That leaves no margin. The only pH that suits both is pH 6.8–7.0, set by bettas and harlequin rasboras. That leaves no margin. Bettas are usually best kept alone. Some accept calm tank mates such as harlequin rasboras, many do not.
• Bronze corydorasThe only temperature that suits both is 25 °C (77 °F), set by bronze corydoras and harlequin rasboras. That leaves no margin.
• Cherry shrimpHarlequin rasboras (5 cm) usually leave adult cherry shrimp (4 cm) alone but eat the young.
• Chili rasboraThe only temperature that suits both is 25 °C (77 °F), set by chili rasboras and harlequin rasboras. That leaves no margin.
• Clown loachThe only temperature that suits both is 25 °C (77 °F), set by clown loaches and harlequin rasboras. That leaves no margin.
• Cockatoo dwarf cichlidThe only pH that suits both is pH 6.0, set by cockatoo dwarf cichlids. That leaves no margin.
• Common plecoThe only pH that suits both is pH 7.0, set by common plecos and harlequin rasboras. That leaves no margin.
• Dwarf gouramiThe only temperature that suits both is 25 °C (77 °F), set by dwarf gouramis and harlequin rasboras. That leaves no margin.
• Endler's livebearerThe only pH that suits both is pH 7.0, set by Endler's livebearers and harlequin rasboras. That leaves no margin.
• GuppyThe only pH that suits both is pH 7.0, set by guppies and harlequin rasboras. That leaves no margin.
• Nerite snailThe only pH that suits both is pH 7.0, set by nerite snails and harlequin rasboras. That leaves no margin.
• Paradise fishThe only temperature that suits both is 22 °C (72 °F), set by harlequin rasboras and paradise fish. That leaves no margin.
• PlatyThe only pH that suits both is pH 7.0, set by platies and harlequin rasboras. That leaves no margin.
• Rosy barbThe only temperature that suits both is 22 °C (72 °F), set by harlequin rasboras and rosy barbs. That leaves no margin.
• SwordtailThe only pH that suits both is pH 7.0, set by swordtails and harlequin rasboras. That leaves no margin.
• White cloud mountain minnowThe only temperature that suits both is 22 °C (72 °F), set by harlequin rasboras and white cloud mountain minnows. That leaves no margin.

Not compatible (9)

• AngelfishAngelfish need 25.6–28.9 °C (78–84 °F); harlequin rasboras need 22–25 °C (72–77 °F). No temperature suits both. The only pH that suits both is pH 6.8–7.0, set by angelfish and harlequin rasboras. That leaves no margin. Angelfish grow to 15 cm and eat animals they can swallow; harlequin rasboras grow to 5 cm.
• Boeseman's rainbowfishBoeseman's rainbowfish need 27–30 °C (81–86 °F); harlequin rasboras need 22–25 °C (72–77 °F). No temperature suits both. The only pH that suits both is pH 7.0, set by Boeseman's rainbowfish and harlequin rasboras. That leaves no margin.
• Convict cichlidConvict cichlids are aggressive and best kept in a tank of their own; they attack fish several times their size, so harlequin rasboras would be harassed. The only pH that suits both is pH 7.0, set by convict cichlids and harlequin rasboras. That leaves no margin. Convict cichlids grow to 15 cm and eat animals they can swallow; harlequin rasboras grow to 5 cm.
• DiscusDiscus need 26–30 °C (79–86 °F); harlequin rasboras need 22–25 °C (72–77 °F). No temperature suits both.
• German blue ramGerman blue rams need 27–30 °C (81–86 °F); harlequin rasboras need 22–25 °C (72–77 °F). No temperature suits both.
• GoldfishHarlequin rasboras need 22–25 °C (72–77 °F); goldfish need 15.6–21.1 °C (60–70 °F). No temperature suits both. The only pH that suits both is pH 7.0, set by goldfish and harlequin rasboras. That leaves no margin.
• MollyMollies need pH 7.5–8.2; harlequin rasboras need pH 5.0–7.0. No pH suits both.
• Mystery snailMystery snails need pH 7.2 or higher; harlequin rasboras need pH 5.0–7.0. No pH suits both.
• OscarOscars grow to 46 cm and eat animals they can swallow; harlequin rasboras grow to 5 cm.

Sources

Where sources differ, the value shown is computed as the most cautious one.

Check against another species Plan a tank