Red Rainbowfish (Glossolepis incisus) is a beginner-level freshwater fish that needs at least 40 gallons and 74-79°F. A deep-bodied rainbowfish in which males turn bright red as they mature. It is peaceful but active, likes hard, alkaline water, and needs a lid and a long tank. Young fish in the store often look plain.
Care facts at a glance
| Scientific name | Glossolepis incisus |
|---|---|
| Family | Melanotaeniidae |
| Origin | Lake Sentani, New Guinea |
| Adult size | 4-6 in |
| Minimum tank | 40 gallons |
| Temperature | 74-79°F |
| pH | 7.0-8.0 |
| Temperament | Peaceful, active |
| Social behavior | Groups of 6+ |
| Swim level | Upper to mid |
| Difficulty | Beginner |
| Diet | Omnivore: flakes, small pellets, frozen foods |
| Typical lifespan | 5-8 years |
Quick tips
- Keep more than six; males color up with company.
- Prefers hard, alkaline water.
- Use a long tank with open swimming space.
San Diego water
Naturally suited to San Diego's hard, alkaline tap water once it is dechlorinated (the city uses chloramine, so use a conditioner that handles it). 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