I love Glofish aquariums. The glow is just so entrancing. The blue LED glow is enhanced if you get products that will glow with the tank. The Glofish brand has many different products available that are guaranteed to glow in their tanks. This is the gravel I went with, and it really does look great. Personally, I think it looks good with or without the light on.
This is a good sized gravel that does the job of covering the bottom of the tank and securing plants and décor. It is mostly black with speckles of colored rocks mixed in. There are a few different colors, from green to pink. The colored pieces glow beautifully when the blue light is on, and it looks really cool. During the day, it just looks like multicolored bits in black. Either way, it looks very modern and not gaudy.
This gravel is no more expensive than other colored gravel you can get for an aquarium. I used one bag for my 10 gallon aquarium and that was plenty. It has about 1/3 of an inch, which is plenty for me. I definitely recommend this one if you have a Glofish tank that you want to enhance with color.