Compatibility Overview
Cardinal Tetra and Mystery Snail 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 40-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Cardinal Tetra | Mystery Snail | Verdict |
|---|---|---|---|
| Temperature | 73–82°F | 68–80°F | ✅ 73–80°F |
| pH Range | 4.5–7.0 | 7.0–8.0 | ⚠️ 7.0–7.0 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 1.5 in | 2 in | ✅ Similar |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 40 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Cardinal Tetra — Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water — a natural companion for discus.
→ Full Cardinal Tetra care guide
Mystery Snail — Pomacea bridgesii
Large, peaceful aquarium snails that graze on algae and detritus. Shell provides some protection but can be harassed by certain fish.
Frequently Asked Questions
Can Cardinal Tetra live with Mystery Snail?
Yes, in a well-planned setup. Cardinal Tetra and Mystery Snail 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 40-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Cardinal Tetra and Mystery Snail together?
A minimum of 40 gallons is recommended for keeping Cardinal Tetra and Mystery Snail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Mystery Snail?
73–80°F
Is a Cardinal Tetra aggressive toward a Mystery Snail?
Cardinal Tetra is peaceful and Mystery Snail is peaceful. pH ranges barely or do not overlap: Cardinal Tetra prefers 4.5–7.0; Mystery Snail prefers 7.0–8.0.