Harlequin Rasbora (Trigonostigma heteromorpha)By Christopher / February 15, 2025 Size: 2 inches Tank Size: Minimum 10 gallons Temperament: Peaceful, schooling fish Water Parameters: 72–80°F, pH 6.0–7.5 Diet: Omnivore (Flakes, frozen food, live insects) Care Notes: Prefers planted tanks; best kept in groups of 6+.