Estes Permaglo Rainbow Gravel (5 lb bags, case of 6) – A playful mix of neon glowing gravel in assorted colors (pink, green, blue, orange, and yellow) that come to life under aquarium blue/actinic lights. This rainbow blend creates a festive, glowing substrate that is ideal for kids’ aquariums or glowfish setups. Each gravel piece is coated to be safe for fish and to maintain its fluorescent brilliance over time. In normal light, it’s a fun multicolor gravel, and under UV light it turns your aquarium into a glowing spectacle. Beyond looks, it still serves as a reliable, inert substrate, making your tank both healthy and visually enchanting.