Do you have any other tanks? If you have two layers, a marginal amount will find it's way to the top, depending on the thickness of the layers. When I've set up small tanks before, I've used a small amount of regular aquasoil at the bottom to save money, but if you won't use the rest of it you won't save money by buying an extra bag.
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My Golden Rule of planted tanks: WWTAD-
"What would Takashi Amano do?"
RAOK Club #69