Compatibility Overview
Bristlenose Pleco and Swordtail 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 55-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Bristlenose Pleco | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 60–80°F | 65–80°F | ✅ 65–80°F |
| pH Range | 6.5–7.5 | 7.0–8.3 | ⚠️ 7.0–7.5 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 5 in | 5 in | ✅ Similar |
| Min. Group | 1+ | 3+ | See below |
| Min. Tank Size | 55 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
Swordtail — Xiphophorus hellerii
Hardy livebearer with a distinctive elongated lower tail fin in males. Peaceful community fish that tolerate a wide temperature range.
Frequently Asked Questions
Can Bristlenose Pleco live with Swordtail?
Yes, in a well-planned setup. Bristlenose Pleco and Swordtail 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 55-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Bristlenose Pleco and Swordtail together?
A minimum of 55 gallons is recommended for keeping Bristlenose Pleco and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Bristlenose Pleco and Swordtail?
65–80°F
Is a Bristlenose Pleco aggressive toward a Swordtail?
Bristlenose Pleco is peaceful and Swordtail is peaceful. Limited pH overlap (7.0–7.5) — maintain pH carefully within this narrow window.