The Marine Betta prefers a tank of at least 60 gallons with plenty of places to hide & swim. The Calloplesiops altivelis is a carnivore and likes to eat variety of live foods (shrimp & fish). The Marine Betta is a low maintenance fish and may act semi-aggressively toward other fish. Not reef-safe, may eat smaller fish & crustaceans. Calloplesiops altivelis, Steindachner 1903, the Comet or Marine Betta. A shy species that requires a dark cave and peaceful tankmates to thrive.