Espei Pencilfish tank mates
Nannostomus espei
5 rated pairings from the Espei Pencilfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Espei Pencilfish needs at least 10 gallons on its own; every companion adds to that.
Excellent matches
4 · Same water, complementary zones, no conflict.
Neon Tetra
Paracheirodon innesi
10 gal min · 1.5" adult · Peaceful
Similar size and peaceful temperament, thrive in same water conditions
Cardinal Tetra
Paracheirodon axelrodi
15 gal min · 2" adult · Peaceful
Compatible schooling fish with identical care requirements
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful bottom dweller that won't compete for food or space
Java Fern
Microsorum pteropus
Provides shelter and natural environment without being uprooted by these gentle fish
Good matches
1 · Compatible with normal care — watch space and numbers.
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.