Pinktail chalceus vs Flag tetra: can they live together?

Verdict: Not recommended

The Pinktail chalceus is aggressive towards other fish.
An adult Pinktail chalceus is about 7 times the length of a Flag tetra and may eat it.
Both are comfortable at 23–28°C (73–82°F).
A pH of 6.0–7.5 suits both.

Side by side

	Pinktail chalceus	Flag tetra
Adult size	25.4 cm (10 in)	3.4 cm (1.3 in)
Minimum tank	210 L (55 US gal)	55 L (15 US gal)
Temperature	23–28°C (73–82°F)	22–28°C (72–82°F)
pH	6.0–7.5	5.5–7.5
Hardness	6–18 dGH (107–321 ppm)	5–15 dGH (89–268 ppm)
Temperament	Aggressive	Peaceful
Community tank	–	Good
Care level	Moderate	Moderate
Diet	Carnivore	Omnivore