I say to only go with either dark grey, black, brown or go where they are native from if it's different from these.
Colored gravel, especially bright colors like blue, white flourescent etc, only wash out the colors of the fish and makes them more timid. That pretty much goes for all fish, no matter how mean or aggro they are, imo.
I have never heard or seen of this glow in the dark gravel until this thread, so can't comment on that. If it's a dark gravel during the day and just glows like some rocks or ornaments do for a few minutes when you shut the light off, then I don't see a problem with it at all. Infact, I see the fish kinda liking that. Just as long as the gravel is darker during the day. The glowing aspect will wear away in a few months anyways.