Dwarf Pencilfish tank mates
Nannostomus marginatus
4 rated pairings from the Dwarf Pencilfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Dwarf Pencilfish needs at least 10 gallons on its own; every companion adds to that.
Excellent matches
2 · Same water, complementary zones, no conflict.
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Similar size, peaceful temperament, and preference for planted tanks with soft water
Ember Tetra
Hyphessobrycon amandae
10 gal min · 0.8" adult · Peaceful
Comparable size and water parameters; both thrive in densely planted nano aquariums
Good matches
2 · Compatible with normal care — watch space and numbers.
Red Cherry Shrimp
Neocaridina davidi
5 gal min · 1.2" adult · Peaceful
Peaceful invertebrates that share similar water preferences; pencilfish may occasionally nip at shrimp
Dwarf Gourami
Trichogaster lalius
15 gal min · 3.5" adult · Semi-aggressive
Peaceful community fish with overlapping temperature range, though larger and may intimidate pencilfish
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.