Brown Tailed Pencilfish – Cuboid Nature Aquarium

Brown Tailed Pencilfish

Brown Tailed Pencilfish(Nannostomus eques) is the most distinctive pencilfish in terms of body posture — where other Nannostomus species hold a moderate oblique tilt,N. equesis virtually vertical at rest, hovering nose-up like a living exclamation point. Also called the Hockey Stick Pencilfish. A single reddish-brown lateral stripe runs the full length of the body.

Feeding & Care Tip:Hikari Micro Pellets(crushed or soaked briefly) andSera Vipan Babymake excellent daily staples. Supplement 2–3× per week withHikari Frozen or Freeze-Dried Baby Brine ShrimpandHikari Frozen Daphnia. Pencilfish are slow, deliberate feeders — avoid fast tankmates that will outcompete them. Feed small amounts 2–3 times daily.

AllNannostomusspecies inhabit the blackwater and clearwater streams, lakes, and flooded forests of the Amazon and Orinoco basins — soft, acidic, tannin-stained water with dense vegetation and leaf litter. A mature blackwater setup with Indian almond leaves, dark substrate, and very soft slightly acidic water produces the most vivid coloration. Males are territorial with each other — keep more females than males and provide visual breaks with dense planting.

The oblique resting posture — head elevated, body angled downward at roughly 45 degrees — is a characteristic behavior of theNannostomusgenus. Schools adopt synchronized oblique positions at rest, which is both fascinating to observe and unmistakable once seen. The angle varies by species — some hold a gentle tilt while others are nearly vertical.N. equestakes the oblique posture to the extreme — nearly vertical at rest, a school appears to be a collection of floating twigs. Keep in groups of at least 8.

One of the most distinctive nano fish available — the vertical posture and elongated body create a fish like no other in the hobby.

Care & Ideal Parameters