Can you keep Cardinal Tetra and Oscar Cichlid together?
Algorithmically generated environmental and behavioral compatibility report.
Algorithmic Assessment
High predation hazard. The size ratio between Oscar Cichlid (12") and Cardinal Tetra (2") exceeds 4:1, and the larger species has a aggressive temperament. The smaller species will likely be hunted or eaten.
Scientific Parameter Comparison
Cross-reference water chemistry, temperature range envelopes, and physical dimensions of Cardinal Tetra and Oscar Cichlid.
| Parameter Metric | Cardinal Tetra | Oscar Cichlid | Calculated Overlap |
|---|---|---|---|
| Temperature Range | 73°F – 81°F | 74°F – 80°F | 74°F – 80°F |
| pH Chemistry | 4.6 – 6.2 | 6.0 – 7.5 | 6.0 – 6.2 |
| Min. Tank Capacity | 10 Gallons | 75 Gallons | 75 Gallons (Minimum) |
| Aquatic Strata Zone | mid | mid | Shared Zone (Layer Conflict) |
| Adult Size (Max) | 2.0" (5 cm) | 12.0" (30 cm) | Ratio: 1 : 6.0 |
⚠ Physiological Mismatch Report
Our stocking engine calculations indicate that putting these two species in the same tank causes acute physiological strain. Below are the calculated parameters that violate safe cohabitation ranges:
Larger predators typically consume tankmates that fit into their mouths. Keeping a 2" species with a 12" species is dangerous.
Behavioral & Environmental Compatibility
⚔️ Do Cardinal Tetra and Oscar Cichlid Fight?
Behavioral analysis indicates a severe compatibility clash. The Oscar Cichlid is known for highly territorial and aggressive behaviors. In a shared environment, it is highly likely to harass, injure, or stress the more peaceful Cardinal Tetra, making them completely incompatible cohabitants.
🍽️ Swimming Layers & Feeding Competition
To satisfy their dietary requirements, offer a varied feeding schedule. Sinking pellets or wafers are ideal for bottom dwellers, while floating flakes or micro-granules support mid and top dwellers. Both species reside in the mid layer. Feeding them simultaneously in different corners of the tank is highly recommended to distribute food and prevent any resource competition in their shared vertical zone.
📏 Size Difference & Predation Threat
A major physical size discrepancy exists between these two species. The Oscar Cichlid grows to 12.0 inches, which is over 6 times larger than the Cardinal Tetra at only 2.0 inches. There is a high risk of predation, as predatory fish will naturally consume any tank mate that can fit into their mouths.
🛠️ Plan Your Aquarium Setup
Planning a tank for Cardinal Tetra and Oscar Cichlid? Ensure your hardware and layout support their physical and water parameter needs:
Safe Tankmate Alternatives for Cardinal Tetra
Since the pairing between Cardinal Tetra and Oscar Cichlid is flagged as incompatible, here are 3 peaceful community tankmates that share a flawless compatibility profile with Cardinal Tetra and match similar water parameters:
Chemistry & Habitat Analysis
Frequently Asked Questions
Are Cardinal Tetra and Oscar Cichlid good tank mates?
High predation hazard. The size ratio between Oscar Cichlid (12") and Cardinal Tetra (2") exceeds 4:1, and the larger species has a aggressive temperament. The smaller species will likely be hunted or eaten.
Can you put Cardinal Tetra and Oscar Cichlid in the same tank together?
Behavioral analysis indicates a severe compatibility clash. The Oscar Cichlid is known for highly territorial and aggressive behaviors. In a shared environment, it is highly likely to harass, injure, or stress the more peaceful Cardinal Tetra, making them completely incompatible cohabitants.
What water temperature and pH parameters do Cardinal Tetra and Oscar Cichlid need?
Both species require compatible parameters. Cardinal Tetra needs a temperature of 73°F to 81°F and a pH of 4.6 to 6.2. Meanwhile, Oscar Cichlid needs a temperature of 74°F to 80°F and a pH of 6.0 to 7.5. Shared overlap range: 74°F–80°F temperature and 6.0–6.2 pH overlap.
What is the minimum combined tank volume required to house Cardinal Tetra and Oscar Cichlid?
To successfully house both species together, a baseline of 75 gallons is required. However, because the setup includes territorial behavior from Oscar Cichlid (aggressive), we recommend an adjusted minimum tank volume of at least 95 gallons (adding a 20-gallon safety buffer) to establish separate visual boundaries and minimize stress.
Do Cardinal Tetra and Oscar Cichlid occupy the same swimming layer?
Both species predominantly dwell in the mid layer. Sharing the exact same vertical zone increases the risk of mid-water open swimming space density and visual boundary conflicts. You must ensure you have adequate decorations, hiding spots, and line-of-sight breaks to mitigate friction.