GloFish Aquarium Gravel - Pink, Green & Blue MixGloFish Aquarium Gravel Pink Green Blue Fluorescent is a great substrate to help illuminate your GloFish even further. This freshwater gravel is coated with fluorescent colors that will make your aquarium "pop" and add brilliant color to your tank. Aquarium substrate gravel approximately . 25" Bright fluorescent colors pink, blue, green Rinse gravel before using