I can't get a clean pic because of the window behind the tank but you get the idea. This pic was after a 25% WC on Friday, another Sunday so it's lightened up a bit in this pic. I use black backgrounds on all my SA tanks with lots of wood/anubias/java moss. Like I said, you and I are using the same quickcrete white media sand.
Tip for you, go buy up all the smaller pieces of mopani wood at your LFS for cheap (mine holds onto the loose chunks for me that are in the bottom of the big bags of wood they buy). It's great for leaching tannins and gives a really good golden color not brown. Instead of putting them in the tank cut the wood into littles slices and toss it in your sump in media bags.