Species Profile
Marine Betta
Calloplesiops altivelis
Also known as: Comet Fish, Marine Comet
Bassletspeaceful
Adult size
8″
Minimum tank
55 gal
Temperature
72–82°F
pH
8.1–8.4
Schooling
Solitary OK
Water level
mid
Diet
Live ghost shrimp transitioning to frozen mysis, silversides, krill
Notes
Not actually a betta, a deep-water comet with long flowing fins covered in white polka dots. Shy nocturnal predator that eats anything that fits in its mouth (1–2″). Stunning under blue actinic lighting.
Compatible Tankmates
Best tank mates for Marine Betta
Every species below passes the compatibility engine when paired with Marine Bettain a suitably sized tank. Verdicts come from the same rules the builder uses — click a card to see that species' own care profile and its tank mates in turn.
Ocellaris Clownfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Blue-Green Chromis
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Royal Gramma
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Firefish Goby
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Yellow Tang
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Percula Clownfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Maroon Clownfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Tomato Clownfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Yellowtail Damselfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Three-Stripe Damselfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Blue Hippo Tang
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Powder Blue Tang
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Photo: George Berninger Jr. / Wikimedia Commons · Source · CC-BY-SA-3.0