Harlequin Rasbora tank mates
Trigonostigma heteromorpha
5 rated pairings from the Harlequin Rasbora care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Harlequin Rasbora needs at least 10 gallons on its own; every companion adds to that.
Excellent matches
3 · Same water, complementary zones, no conflict.
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful bottom-dweller with identical water parameter requirements; excellent algae control without competing for food
Neon Tetra
Paracheirodon innesi
10 gal min · 1.5" adult · Peaceful
Similar size, temperament, and water preferences; creates beautiful mixed schooling displays
Rummy Nose Tetra
Hemigrammus rhodostomus
15 gal min · 2" adult · Peaceful
Peaceful schooler with matching water chemistry needs and compatible midwater behavior
Good matches
2 · Compatible with normal care — watch space and numbers.Dwarf Gourami
Trichogaster lalius
15 gal min · 3.5" adult · Semi-aggressive
Peaceful and non-aggressive; slightly different water layer preference adds diversity without conflict
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Peaceful invertebrates that occupy different ecological niche; may occasionally be eaten by larger rasboras but generally compatible
Also recommended alongside Harlequin Rasbora
Species whose own guides list Harlequin Rasbora as a tank mate.
Julii Corydoras
Corydoras julii
15 gal min · 2.5" adult · Peaceful
Panda Corydoras
Corydoras panda
15 gal min · 2" adult · Peaceful
Peppered Corydoras
Corydoras paleatus
20 gal min · 2.75" adult · Peaceful
Albino Corydoras
Corydoras aeneus
15 gal min · 2.5" adult · Peaceful
Bolivian Ram
Mikrogeophagus altispinosus
20 gal min · 3.5" adult · Peaceful
Japanese Trapdoor Snail
Cipangopaludina japonica
10 gal min · 2" adult · Peaceful
Tiger Barb
Puntigrus tetrazona
20 gal min · 3" adult · Semi-aggressive
Gold Barb
Barbodes semifasciolatus
20 gal min · 3" adult · Peaceful
Venezuelan Corydoras
Corydoras venezuelanus
15 gal min · 2.5" adult · Peaceful
African Dwarf Frog
Hymenochirus boettgeri
5 gal min · 1.5" adult · Peaceful
Banded Rainbowfish
Melanotaenia trifasciata
40 gal min · 5" adult · Peaceful
Black Kuhli Loach
Pangio oblonga
20 gal min · 4" adult · Peaceful
Boesemani Rainbowfish
Melanotaenia boesemani
30 gal min · 4.5" adult · Peaceful
Clown Loach
Chromobotia macracanthus
75 gal min · 12" adult · Peaceful
Odessa Barb
Pethia padamya
20 gal min · 3" adult · Semi-aggressive
Red Eye Tetra
Moenkhausia sanctaefilomenae
20 gal min · 2.2" adult · Peaceful
Skunk Corydoras
Corydoras arcuatus
15 gal min · 2.5" adult · Peaceful
Turquoise Rainbowfish
Melanotaenia lacustris
30 gal min · 4.5" adult · Peaceful
Albino Tiger Barb
Puntigrus tetrazona
20 gal min · 3" adult · Semi-aggressive
Apistogramma Baenschi
Apistogramma baenschi
20 gal min · 3" adult · Semi-aggressive
Australian Rainbowfish
Melanotaenia fluviatilis
30 gal min · 4" adult · Peaceful
Axelrodi Corydoras
Corydoras axelrodi
15 gal min · 2" adult · Peaceful
Balloon Ram
Mikrogeophagus ramirezi
20 gal min · 2" adult · Peaceful
Banded Gourami
Trichogaster fasciata
30 gal min · 4.5" adult · Semi-aggressive
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.