Freshwater Fish
Harlequin Rasbora.
A coppery-orange rasbora marked with a bold black triangle — peaceful, hardy, and beautiful in a tight school. A beginner favorite; a group shoals beautifully in a planted 10-gallon-plus tank with soft water.
We keep this species at our Erie store. Come and see it in the tanks, or call (814) 456-9445 and ask what we have in right now.
Sea Cave keeps this species. You will find these in the tanks at 660 East 14th Street in Erie. We never ship live animals.
- Condition
- new
- Fulfillment
- Local pickup — Erie, PA
We never ship fish, coral, or invertebrates — every animal here is one you meet in person. Each one is acclimated and health-checked in-house before it goes out into the display tanks. This is a species we keep, and what is swimming on any given day changes with the deliveries, so please call (814) 456-9445 before you drive in.
Care at a glance
What to know before you take one home.
- Care level
- Beginner
- Temperament
- Peaceful
- Community
- Community safe
- Adult size
- 2"
- Min tank size
- 10 gallons
- Diet
- Omnivore
- Scientific name
- Trigonostigma heteromorpha
Good tank mates
Harlequins are peaceful and community-safe, so they're an easy fit for a calm community tank. Great matches are other small, peaceful fish: tetras, other rasboras, corydoras, small peaceful gouramis like honey gouramis, and small livebearers. A few real examples are ember tetras, neon tetras, and bronze cories. Steer clear of fin-nippers like tiger barbs and of larger or aggressive fish, and avoid any tankmate big enough to swallow a small rasbora.
Good to know
The harlequin rasbora is named for the bold black wedge-shaped patch on the rear half of its body.
What is in the tanks and each animal's temperament vary — call (814) 456-9445 for pairing advice.
Good tankmates
Plays well with.
Species we’d keep in the same tank, with why each pairing works. What is in the tanks and each animal’s temperament vary — call (814) 456-9445 for advice on pairing.
New to stocking a tank? Read our guide on which fish live together.
Neon Tetra
A well-documented peaceful schooling companion with near-identical water requirements (pH 5.0–7.0, 72–77°F). Both species occupy the mid-water column without competing territorially, and multiple authoritative sources confirm this as one of the most natural community pairings for harlequin rasboras.
Bronze Cory
Peaceful, armored bottom-dwellers that share the same soft, slightly acidic Southeast Asian water conditions and occupy an entirely different tank level than the mid-water harlequins. Zero territory overlap, confirmed compatible across multiple care guides.
Rummy-Nose Tetra
A similarly sized, tight-schooling peaceful tetra with compatible water parameters (pH 5.5–7.0, temperature best held at 74–77°F where both species overlap). Both are non-aggressive mid-water schoolers, confirmed compatible by multiple sources.
Cherry Barb
One of the only barb species with no documented fin-nipping tendency. Stays under 2 inches, peaceful, and confirmed by multiple care guides as a safe small-barb companion for harlequin rasboras. Similar water parameter requirements; adequate space and cover recommended as both species use the mid-column.
- K
Kuhli Loach
Both species originate from the same Southeast Asian blackwater streams and share highly compatible parameters (pH 5.5–7.0, 73–77°F overlap). Kuhli loaches are nocturnal substrate-burrowers with no aggression toward mid-water fish, creating a textbook niche separation.
Visit the store
660 East 14th Street,
Erie, PA.
Mon–Fri 12–6 · Sat 11–4 · Sun closed. Call ahead on livestock — what's on the floor rotates.