S
Swordtail
Xiphophorus hellerii
VS
T
Threadfin Rainbowfish
Iriatherina werneri
Choosing between Swordtail and Threadfin Rainbowfish? Both are excellent choices, but they have different care requirements and temperaments. Use the detailed comparison below to make an informed decision based on your experience level, tank size, and community goals.
Swordtail
Xiphophorus helleriiVS
Threadfin Rainbowfish
Iriatherina werneriCommon Name
Swordtail
Threadfin Rainbowfish
Scientific Name
Xiphophorus hellerii
Iriatherina werneri
Type
Freshwater
Freshwater
Difficulty
Beginner Friendly
Intermediate
Temperament
Peaceful
Peaceful
Minimum Tank
15 gallons
10 gallons
Recommended Tank
29 gallons
20 gallons
Temperature
72°F - 82°F
75°F - 82°F
pH Range
7 - 8.4
6 - 7.5
Max Size
5.5 inches
2 inches
Lifespan
3-5 years
3-5 years
Diet
High-quality flake food, Algae-based foods, Vegetable matter, Frozen bloodworms, Brine shrimp, Daphnia
Small pellets, Frozen foods, Brine shrimp, Daphnia
Swordtail
✓ Good For
- Community tanks
- Beginners
Threadfin Rainbowfish
✓ Good For
- Community tanks
- Small tanks
- Schooling displays
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