Estes Permaglo Neon Green Gravel (5 lb bags, case of 6) – Electric green fluorescent aquarium gravel that fluoresces under blue or UV aquarium lighting. This bright neon-green substrate is perfect for “glofish” tanks or anyone wanting a fun, glowing effect in their aquarium. It’s made with Estes’ permaglo technology—each pebble is infused with long-lasting, fish-safe color that glows without affecting water quality. Use it to create exciting nighttime visuals and highlight glow-themed accessories. By day it’s a bold green, and under actinic light it adds an eerie neon glow, all while functioning as a normal gravel bed to support aquatic life.