I just like the look of sand better than bare bottom, I may regret it, but I love the sand look.
As for the 2 valves, 1 of them is just acting as a spacer/coupler. I cut my pipe a weee bit to short and since I had a second valve laying around, I added it to the system. I will be redoing the whole return line when I get around to it, the new setup will elliminate at least 2 90's and maybe other ineffiecencies, which should give me a little but more return flow.
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If it is just us,
It seems like an awful waste of space.
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