Type of sand for substrate?

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qquake2k

Aquarium Advice Apprentice
Joined
May 1, 2009
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24
I'm setting up a new 46 gallon glass bowfront, and want to use sand as the substrate. In the past, I've used swimming pool filter sand. But I have that in my 16 gallon, and the top layer is turning dark brown. Are there better sands out there? PetSmart sells National Geographic brand sand, but it's $20 per 25lb bag. Is it really that much better?
 
Here are a couple photos of the sand in the 16.
 

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