I've heard of a few people doing it.
Personally, I think white has more benefit in that it will reflect a bit of light back up to the undersides of the corals. How much and how significant I don't know...
I use black. Looks great! You just have to siphon when you do a WC + keep the flow near the bottom and crank the skimmer up. No more algae outbreaks and I clean the glass once every two weeks.
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