Coral Red Pencilfish tank mates
Nannostomus mortenthaleri
6 rated pairings from the Coral Red Pencilfish care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Coral Red Pencilfish needs at least 10 gallons on its own; every companion adds to that.
Excellent matches
4 · Same water, complementary zones, no conflict.
Emerald Dwarf Rasbora
Danio erythromicron
10 gal min · 1" adult · Peaceful
Similar size, peaceful temperament, and preference for soft acidic water make them ideal companions
Otocinclus
Otocinclus vittatus
10 gal min · 1.5" adult · Peaceful
Peaceful algae eater that thrives in the same soft, acidic conditions without competing for micro prey
Dwarf Hairgrass
Eleocharis parvula
Foreground plant that provides shelter and natural habitat structure pencilfish prefer
Anubias Nana
Anubias barteri var. nana
Low-light plant that creates the dense vegetation pencilfish need for security and natural behavior
Good matches
1 · Compatible with normal care — watch space and numbers.
Use caution
1 · Works in the right setup; read the note before combining.Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.