8 beautiful fishes that belong only in big aquariums
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Arowana
Known for its sleek, metallic body and graceful swimming, the Arowana can grow up to 3 feet long and needs at least a 250-gallon tank.
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Oscar Fish
These intelligent and interactive fish can grow up to 12–14 inches. They need at least a 75-gallon tank per pair due to their territorial nature.
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Discus
Discus fish are stunning but delicate. Though not huge in size (6–8 inches), they need a spacious, tall tank (minimum 100 gallons for a group) with pristine water.
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Pacus
Often mistaken for piranhas, Pacus can grow over 2 feet and are herbivores. They need at least a 300-gallon tank and are not suited for beginner hobbyists.
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Clown Loach
Playful and social, clown loaches can grow up to 12 inches and should be kept in groups. A 125-gallon tank is the minimum to keep them happy.
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Silver Dollar Fish
These fast swimmers do best in groups and can grow to 6 inches each. A school requires a minimum of 125 gallons with ample swimming space.
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Redtail Catfish
A true monster fish, it can grow over 4 feet long. It requires a pond-sized tank (at least 500 gallons) and is not suitable for home aquariums.
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Tinfoil Barb
A shimmering, active fish that grows up to 14 inches. Tinfoil barbs are schooling fish and need at least 150 gallons to accommodate their energetic swimming.
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