The Rainbow Shiner is scientifically known as Notropis chrosomus.

This North American native fish is famous for its breathtaking breeding colors. Outside of breeding season, they are sleek silver with subtle striping. But when males are in breeding condition, they explode with neon pink, electric blue, and fiery red tones that look almost unreal.

They typically grow to about 2–3 inches (5–7.5 cm) and have a streamlined, torpedo-shaped body built for swimming in flowing water.

Care Instructions

Tank Size

• Minimum 20 gallons

• Best kept in schools of 6 or more

• Larger groups encourage natural behavior and better color display

Water Parameters

• Temperature: 60–74°F (16–23°C)

• Prefer cooler water

• pH: 6.5–8.0

• Moderate to hard water

They thrive in well-oxygenated water with noticeable flow, similar to their native streams.

 Tank Setup

• Strong filtration and good water movement

• Smooth river rocks and open swimming space

• Sand or fine gravel substrate

• Can be kept in planted tanks, but prefer open areas

A secure lid is recommended — they are active swimmers.

What Do Rainbow Shiners Eat?

Rainbow Shiners are omnivores.

Staple Diet

• High-quality flakes

• Small sinking pellets

Protein Foods (important for color)

• Bloodworms

• Brine shrimp

• Daphnia

• Blackworms

Feed 1–2 small meals daily. A varied diet enhances their vibrant coloration.

Fun Facts

• Their breeding coloration is among the most vibrant of any North American freshwater fish.

• They are native to the southeastern United States, especially Alabama and Georgia.

• Cooler water helps maintain their health and vibrant colors.

• They are peaceful but very energetic.

• In breeding season, males can glow so brightly they look almost artificial.