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similar to other Ctenopomas
min 30G
pH 6-7.5 (6.8 ideal), 3-18 dH (8 ideal), 77-82°F (25-28°C)
Males are belligerent towards one another, otherwise a peaceful species that can be combined with peaceful fish. Small fish may be preyed upon.
food for wild fish include, earthworms, small amphibians, small fish and crustaceans supplemented with some vegetation.
captive fish should have this taken into account and be fed live foods regularly (bloodworm, earthworm, glassworms etc.)
I think cardinals maybe safe, but most of the fish in this family are lightening fast when they strike.
try it and if you cardinals start to disappear, then you have your definitive answer.
they may be in the same family as gourami but that is only because of the labyrinth organ.
think of the as perch because that is what they truly are,
small predatory and have an attitude.
having said that I can't see any gourami being a threat to it or it to them.