Molly

Poecilia sphenops

Also known as: Black Molly, Short-fin Molly

A larger livebearer that loves hard, mineral-rich (even lightly salted) water.

Water

Freshwater

Temperature

72–82°F

pH

7–8.5

Hardness

15–30 dGH

Max size

4.5 in

Min tank

20 gal

Temperament

Peaceful

Social

Groups (3+)

Swim level

All

Diet

Omnivore

Care level

Beginner

Lifespan

3-5 years

Breeding

Livebearer

Suitability

Common

Origin

Central America

Mollies do best in hard, alkaline water and some keepers add a little salt, though it isn't required. They are sensitive to poor water quality despite their hardy reputation.