Threadfin Acara (Acarichthys heckelii) is a intermediate-level freshwater fish that needs at least 75 gallons and 75-82°F. A sand-sifting South American cichlid with a mottled pattern and a dark spot on the side. It is calmer than many large cichlids but still needs a roomy tank and fish of similar size.
Care facts at a glance
| Scientific name | Acarichthys heckelii |
|---|---|
| Family | Cichlidae |
| Origin | Amazon and Guianas, northern South America |
| Adult size | 8-10 in |
| Minimum tank | 75 gallons |
| Temperature | 75-82°F |
| pH | 6.0-7.5 |
| Temperament | Semi-aggressive, territorial when breeding |
| Social behavior | Solitary or a pair |
| Swim level | Bottom to mid |
| Difficulty | Intermediate |
| Diet | Omnivore leaning carnivore: pellets, frozen foods, worms |
| Typical lifespan | 8-10 years |
Quick tips
- Use soft sand so it can sift without scratching its mouth.
- Keep tankmates too big to swallow and not easily bullied.
- Provide caves or wood for pairs that breed.
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