Can mollies live with black neon tetras?

Verdict

Yes, with care

Yes, with care. Mollies and black neon tetras can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.5.

Molly72–82°F · pH 7.5–8.5

Black neon tetra73–81°F · pH 5.5–7.5

What to watch

Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.5.

What works

Both are fine at 73–81°F.
They use different parts of the tank: mollies the top, black neon tetras the mid.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

	Molly	Black neon tetra
Temperature	72–82 °F	73–81 °F
pH	7.5–8.5	5.5–7.5
Adult size	4.0 in	1.5 in
Minimum tank	20 gal	15 gal
Temperament	Peaceful	Peaceful
Swims at	Top	Middle
Group	Groups of 3+	Groups of 6+
Diet	Omnivore	Omnivore

Better tank mates for mollies

All molly tank mates

Better tank mates for black neon tetras

All black neon tetra tank mates

Questions

Can mollies live with black neon tetras?

Yes, with care. Mollies and black neon tetras can share a tank, but watch one thing. Water chemistry is a squeeze. The only pH that suits both is around 7.5.

What temperature suits both mollies and black neon tetras?

73–81 °F. Mollies need 72–82 °F, black neon tetras need 73–81 °F.

What size tank do mollies and black neon tetras need together?

At least 20 gal, set by the molly. Add space for each extra fish.