Black Ruby Barb (Pethia nigrofasciata) is a beginner-level freshwater fish that needs at least 30 gallons and 72-79°F. A small, active barb whose males turn deep ruby and black when settled and well fed. It is hardy and good in community tanks, but keep a group so the nipping is spread out, and avoid slow, long-finned tankmates.
Care facts at a glance
| Scientific name | Pethia nigrofasciata |
|---|---|
| Family | Cyprinidae |
| Origin | Sri Lanka |
| Adult size | 2.5-3 in |
| Minimum tank | 30 gallons |
| Temperature | 72-79°F |
| pH | 6.0-7.5 |
| Temperament | Peaceful to lively; may nip long fins |
| Social behavior | Schooling, keep 6+ |
| Swim level | Mid |
| Difficulty | Beginner |
| Diet | Omnivore: flakes, micro pellets, frozen foods, some vegetables |
| Typical lifespan | 4-6 years |
Quick tips
- Keep a group of six or more.
- Avoid long-finned, slow tankmates.
- Give it plants and some open swimming space.
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