Can Cockatoo Dwarf Cichlid live with Yellow Tang?
High risk due to water mismatch, aggression, or predation.
Why Cockatoo Dwarf Cichlid and Yellow Tang Don't Make an Easy Pair
The size gap is 4.0" — Cockatoo Dwarf Cichlid (3.0") and Yellow Tang (7.0"). A fish that fits in another fish's mouth will eventually end up there.
Cockatoo Dwarf Cichlid
Apistogramma cacatuoides
| Adult Size: | 3.0" |
| Temperament: | semi-aggressive |
| Min Tank: | 20 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.0-7.5 |
Yellow Tang
Zebrasoma flavescens
| Adult Size: | 7.0" |
| Temperament: | semi-aggressive |
| Min Tank: | 75 gal |
| Temperature: | 75-80°F |
| pH Range: | 8.1-8.4 |
Water Parameter Overlap
| Parameter | Cockatoo Dwarf Cichlid | Yellow Tang | Overlap |
|---|---|---|---|
| Temperature | 75-82°F | 75-80°F | 5°F ✓ |
| pH | 6.0-7.5 | 8.1-8.4 | No overlap ✗ |
Compatibility Breakdown
Temperament Match: semi-aggressive + semi-aggressive. Semi-aggressive → watch territory and feeding.
⚠️ Size Predation Risk: Cockatoo Dwarf Cichlid (3.0") vs Yellow Tang (7.0"). A 4.0" gap — the larger fish will view the smaller fish as food.
⚠️ Diet Conflict: A carnivore sharing water with a fish small enough to fit in its mouth is a waiting game. Feed generously, but the risk is structural — not something you can manage meal by meal.
Score: 30/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 75 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 75°F and 80°F.
- pH: no shared range. One species will be outside its tolerance regardless of what you set.
- Hiding spots: essential for Cockatoo Dwarf Cichlid — caves, plants, or driftwood to retreat when feeling stressed.
- Water changes: 25% weekly minimum. Two species mean double the bioload.
🔧 Tank Stocking Calculator
Enter tank size to calculate safe stocking levels:
Recommended Equipment
Based on tank size 75+ gallons:
Dried seaweed sheets for marine herbivores
Explore Related Checks
See what else works with these fish:
⚠️ Common Reasons This Pairing Fails in Practice
- Size-based predation: The 4.0" size gap means the larger fish may eat the smaller one once it grows to full size. This is not fixable with more hiding spots.
- Diet-driven aggression: A carnivore sharing a tank with bite-sized tank mates creates structural risk — no amount of generous feeding eliminates the instinct to hunt.
- Double semi-aggressive: Two territorial species in the same tank creates competition for prime real estate. Provide distinct territories or expect fin-nipping and chasing.
- Overcrowding: Even compatible species fail in tanks that are too small. Double the species means double the bioload — 25% weekly water changes are the minimum.
- Inadequate acclimation: Adding both species on the same day without quarantine is a common mistake. Always drip-acclimate new arrivals and quarantine for 2–4 weeks.
- Mismatched feeding: Cockatoo Dwarf Cichlid is a carnivore while Yellow Tang is a herbivore. Use targeted feeding zones and sinking vs. floating food to ensure both get proper nutrition.
Tools & Resources
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a semi-aggressive individual Cockatoo Dwarf Cichlid may act differently from its species average. Always observe, quarantine new arrivals for 2-4 weeks, and avoid overcrowding. If a pairing says CAUTION, start with a smaller group and a lid.