Porthole Catfish (Dianema longibarbis) is a beginner-level freshwater fish that needs at least 30 gallons and 72-79°F. A calm armored catfish with a row of small light dots along each side, and it often swims higher in the tank than corydoras. It needs a group, soft sand or smooth gravel, and a gently flowing, planted tank.
Care facts at a glance
| Scientific name | Dianema longibarbis |
|---|---|
| Family | Callichthyidae |
| Origin | Amazon basin, South America |
| Adult size | 4 in |
| Minimum tank | 30 gallons |
| Temperature | 72-79°F |
| pH | 6.0-7.5 |
| Temperament | Peaceful |
| Social behavior | Groups of 5+ |
| Swim level | Bottom to mid |
| Difficulty | Beginner |
| Diet | Omnivore: sinking pellets, wafers, frozen foods |
| Typical lifespan | 8-10 years |
Quick tips
- Keep five or more together.
- Use smooth sand or fine gravel and offer sinking foods.
- Gulps air at the surface; keep the lid close but leave an air gap.
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