Aquarium Planner

A beginner-friendly fish guide

Least Killifish

Least Killifish

Heterandria formosa

Gentle temperament; shoaling fish. Check the planner before choosing tank mates.

Beginner level 4/5

A good environment

Recommended temperature
20 ~ 26°C
Recommended pH
7.0 ~ 8.0
Preferred water hardness
Medium to hard
Minimum aquarium
38L or more

At a glance

Group
Livebearers
Average adult size
about 3.5 cm (small)
Minimum tank length
about 45 cm
Activity level
Moderate
Waste level
Low
Lid recommended
Not required
Mature tank preferred
Not required

Temperament & group size

Gentle temperament; Shoaling fish.

For a comfortable group, keep at least 6.

Usually swims in the middle.

Tank-mate notes

Adult shrimp may do well with hiding places, though individual fish vary.

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

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

Add Least Killifish to my aquarium

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Frequently asked questions

How big does Least Killifish get, and what tank size does it need?

Adults average about 3.5 cm, a small species. The planner recommends an aquarium of at least 38 L and about 45 cm long.

What water temperature and pH does Least Killifish need?

The planner range is 20~26°C and pH 7.0~8.0, with medium to hard.

How many Least Killifish should be kept together?

Shoaling fish: keep at least 6. Temperament is gentle.

Can Least Killifish live with shrimp?

Adult shrimp: usually fine. Baby shrimp: not recommended.

Is Least Killifish a good fish for beginners?

Beginner level 4/5. Activity: moderate; waste: low.