Compatibility Overview
Bristlenose Pleco and Cardinal Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Bristlenose Pleco | Cardinal Tetra | Verdict |
|---|---|---|---|
| Temperature | 60–80°F | 73–82°F | ✅ 73–80°F |
| pH Range | 6.5–7.5 | 4.5–7.0 | ⚠️ 6.5–7.0 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 5 in | 1.5 in | ⚠️ 3.3× difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Bristlenose Pleco — Ancistrus sp.
Hardy armoured catfish that grazes on algae. Peaceful with virtually all species; tolerates a wide temperature range.
→ Full Bristlenose Pleco care guide
Cardinal Tetra — Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water — a natural companion for discus.
Frequently Asked Questions
Can Bristlenose Pleco live with Cardinal Tetra?
Yes, in a well-planned setup. Bristlenose Pleco and Cardinal Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Bristlenose Pleco and Cardinal Tetra together?
A minimum of 75 gallons is recommended for keeping Bristlenose Pleco and Cardinal Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Bristlenose Pleco and Cardinal Tetra?
73–80°F
Is a Bristlenose Pleco aggressive toward a Cardinal Tetra?
Bristlenose Pleco is peaceful and Cardinal Tetra is peaceful. Limited pH overlap (6.5–7.0) — maintain pH carefully within this narrow window.