Who We Are at Red Fish Blue Fish Aquatics, LLc

    The Denisonii Barb (Sahyadria denisonii), also known as the Roseline shark, is an active, striking freshwater schooling fish native to fast-flowing hill streams in India. They grow to 4.5–6 inches, require a minimum 55-gallon long tank with strong current and high oxygen, and thrive best at 70–77°F in groups of six or more. [

• Minimum Tank Size: 55 gallons (75+ gallons preferred) in a long configuration for swimming space.
• Water Temperature: 70–77°F (prefers cooler, subtropical conditions; avoid long-term exposure above 80°F).
• pH Level: 6.5–7.8.
• Water Flow: High oxygenation and moderate-to-strong water movement via powerheads or filters to mimic river habitats.
• Maintenance: Pristine water quality with zero ammonia/nitrite and weekly partial water changes.

Social Behavior & Tank Mates

• Schooling: Must be kept in a group of at least 6 to 8 individuals (ideally 10+) to reduce skittishness and stress.
• Compatibility: Peaceful community fish that pair well with rainbowfish, larger tetras, danios, and peaceful cichlids.
• Avoid: Slow-moving, long-finned fish (like bettas or fancy angelfish) that can get nipped, or tiny nano fish/dwarf shrimp that may be viewed as food.