Harlequin Rasbora (Trigonostigma heteromorpha) is a beginner-level freshwater fish that needs at least 10 gallons and 72-81°F. A calm, copper-colored school fish with a black triangle. One of the most reliable community fish for planted tanks.
Care facts at a glance
| Scientific name | Trigonostigma heteromorpha |
|---|---|
| Family | Danionidae |
| Origin | Southeast Asia |
| Adult size | 2 in |
| Minimum tank | 10 gallons |
| Temperature | 72-81°F |
| pH | 6.0-7.5 |
| Temperament | Peaceful |
| Social behavior | Schooling, keep 6+ |
| Swim level | Mid |
| Difficulty | Beginner |
| Diet | Omnivore: flakes, micro pellets, frozen foods |
| Typical lifespan | 3-5 years |
Quick tips
- Keep a group of six or more.
- Do well with small peaceful tankmates and shrimp.
San Diego water
Captive-bred stock usually adapts to San Diego tap water with slow acclimation. For best color and health, many keepers blend tap with RO/DI water. Learn the numbers in our San Diego tap water guide.
Before you buy
Make sure your tank is cycled (how to cycle a tank), check your numbers with the water testing guide, and use the compatibility guide to check tankmates. These are general ranges; individual fish and local water vary.
Find it at Pet Zone
Pet Zone Tropical Fish is a San Diego aquarium store with two locations. Stock changes daily, so call ahead if you are after a specific species or plant. Shop online at petzonesd.com.
4160 Convoy St, San Diego, CA 92111
(858) 987-0309
Open daily, 10am-6pm
Aquascaping, planted tanks
4266 University Ave, San Diego, CA 92105
(619) 283-1812
Closed Monday; Tue-Fri 10:30am-6pm, Sat 11am-6pm, Sun 11am-4pm
Monster fish, koi