Coral Red Pencilfish

Nannostomus mortenthaleri

Also known as: True Red Pencilfish, Peru Red Pencilfish

One of the reddest small aquarium fish, with males colored a deep coral red.

Water

Freshwater

Temperature

73–82°F

pH

5–7

Hardness

1–8 dGH

Max size

1.4 in

Min tank

15 gal

Temperament

Peaceful

Social

Groups (6+)

Swim level

Mid-top

Diet

Omnivore

Care level

Intermediate

Lifespan

3-5 years

Breeding

Egg-scatterer

Suitability

Intermediate

Origin

Rio Nanay and nearby tributaries, Peru

Keep a group of 6 or more with more females than males, since males spar. Needs soft, acidic water, dense plants and gentle flow to show its color. Small mouth, so feed fine foods and avoid boisterous tankmates that outcompete it.