Exclamation Point Rasbora (Boraras urophthalmoides) is a intermediate-level freshwater fish that needs at least 10 gallons and 72-80°F. One of the smallest aquarium fish, named for the dark stripe and spot that look like an exclamation point. It needs a calm planted tank, a group, and tankmates small and gentle enough not to bully or eat it.
Care facts at a glance
| Scientific name | Boraras urophthalmoides |
|---|---|
| Family | Danionidae |
| Origin | Southeast Asia |
| Adult size | 0.8-1 in |
| Minimum tank | 10 gallons |
| Temperature | 72-80°F |
| pH | 5.5-7.5 |
| Temperament | Peaceful, shy |
| Social behavior | Schooling, keep 8+ |
| Swim level | Mid to upper |
| Difficulty | Intermediate |
| Diet | Micro pellets, crushed flakes, baby brine shrimp, tiny frozen foods |
| Typical lifespan | 2-4 years |
Quick tips
- Keep a group of eight or more.
- Only pair with very small, calm tankmates.
- Feed tiny foods and keep the tank clean and stable.
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