Red rainbowfish vs Redtail splitfin: can they live together?

Verdict: With caution

The Redtail splitfin can be semi-aggressive or nip fins.
The Red rainbowfish grows about twice as long as the Redtail splitfin; watch for bullying or predation.
Both are comfortable at 22–25°C (72–77°F).
A pH of 7.0–8.0 suits both.
Minimum tank for the pair: 150 L (40 US gal)

Side by side

	Red rainbowfish	Redtail splitfin
Adult size	12 cm (4.7 in)	6 cm (2.4 in)
Minimum tank	150 L (40 US gal)	75 L (20 US gal)
Temperature	22–25°C (72–77°F)	15–32°C (59–90°F)
pH	7.0–8.0	6.0–8.0
Hardness	9–19 dGH (161–339 ppm)	9–19 dGH (161–339 ppm)
Temperament	Peaceful	Semi-aggressive
Community tank	Good	Good
Care level	Easy	Easy
Diet	Omnivore	Omnivore