Aquarium Planner

A beginner-friendly fish guide

Short-fin Molly

Short-fin Molly / Black Molly

Poecilia sphenops

Gentle temperament; social. Check the planner before choosing tank mates.

Beginner level 3/5

A good environment

Recommended temperature
23 ~ 27°C
Recommended pH
7.4 ~ 8.3
Preferred water hardness
Medium hardness
Minimum aquarium
76L or more

Reference sources list a wider range of 21~28°C and pH 7.0~8.5. The planner uses the narrower range above as a safer starting point for beginners.

At a glance

Group
Livebearers
Average adult size
about 8 cm (medium)
Minimum tank length
about 90 cm
Activity level
High
Waste level
High
Lid recommended
Yes
Mature tank preferred
Not required

Temperament & group size

Gentle temperament; Social.

For a comfortable group, keep at least 3.

Usually swims in the upper & middle.

Tank-mate notes

Adult shrimp may be attacked; take care with shrimp tank mates.

Baby shrimp may be eaten. A separate breeding tank is safer.

Check each combination carefully, especially when size or temperament differs.

Add Short-fin Molly to my aquarium

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Frequently asked questions

How big does Short-fin Molly get, and what tank size does it need?

Adults average about 8 cm, a medium species. The planner recommends an aquarium of at least 76 L and about 90 cm long.

What water temperature and pH does Short-fin Molly need?

The planner range is 23~27°C and pH 7.4~8.3, with medium hardness. Reference sources list a wider range of 21~28°C and pH 7.0~8.5. The planner uses the narrower range above as a safer starting point for beginners.

How many Short-fin Molly should be kept together?

Social: keep at least 3. Temperament is gentle.

Can Short-fin Molly live with shrimp?

Adult shrimp: not recommended. Baby shrimp: not recommended.

Is Short-fin Molly a good fish for beginners?

Beginner level 3/5. A lid is recommended. Activity: high; waste: high.