Compatibility Overview
Bristlenose Pleco and Harlequin Rasbora 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 | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 60–80°F | 72–81°F | ✅ 72–80°F |
| pH Range | 6.5–7.5 | 5.5–7.5 | ✅ 6.5–7.5 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 5 in | 1.75 in | ⚠️ 2.9× difference |
| Min. Group | 1+ | 8+ | 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
Harlequin Rasbora — Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Bristlenose Pleco live with Harlequin Rasbora?
Yes, in a well-planned setup. Bristlenose Pleco and Harlequin Rasbora 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 Harlequin Rasbora together?
A minimum of 75 gallons is recommended for keeping Bristlenose Pleco and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Bristlenose Pleco and Harlequin Rasbora?
72–80°F
Is a Bristlenose Pleco aggressive toward a Harlequin Rasbora?
Bristlenose Pleco is peaceful and Harlequin Rasbora is peaceful. No major aggression issues are expected between these species.