Can Black Ghost Knife and Discus live together?

Black Ghost Knife and Discus are possible with care. The comparison on this page runs the same compatibility engine as the tank builder, checking temperature and pH overlap, predation by size, temperament, and known hard-pair conflicts.

Species Comparison

Black Ghost Knife vs Discus

Black Ghost Knife

Apteronotus albifrons

Discus

Symphysodon aequifasciatus

Verdict:Possible with care

Side-by-side specs

Oddballs

Family

Cichlids

18″

Adult size

6″

100gal

Min tank

75gal

75–82°F

Temperature

82–88°F

6.5–7.5

5.5–7

peaceful

Temperament

peaceful

Solitary

Schooling

bottom

Water level

mid

Compatibility notes

warnBlack Ghost Knife and Discus only narrowly overlap in temperature — keep within 82–82°F.

Try both in the builder →Compare different species