Can congo tetras live with mollies?

Verdict

Yes, with care

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

Congo tetra73–82°F · pH 6–7.5

Molly72–82°F · pH 7.5–8.5

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 73–82°F.
They use different parts of the tank: congo tetras the mid, mollies the top.

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

	Congo tetra	Molly
Temperature	73–82 °F	72–82 °F
pH	6–7.5	7.5–8.5
Adult size	3.0 in	4.0 in
Minimum tank	30 gal	20 gal
Temperament	Peaceful	Peaceful
Swims at	Middle	Top
Group	Groups of 6+	Groups of 3+
Diet	Omnivore	Omnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for mollies

All molly tank mates

Questions

Can congo tetras live with mollies?

Yes, with care. Congo tetras and mollies 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 congo tetras and mollies?

73–82 °F. Congo tetras need 73–82 °F, mollies need 72–82 °F.

What size tank do congo tetras and mollies need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.