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A dark background would really set it off. A dark blue or black would look good. The cobbles look great, the trick is to try and make it so the piles of rocks are not exactly uniform. I know they are hard to stack and it takes time to get it natural looking. I like the look of cobbles in a tank.
If you can get a flow maker, you can create a current around and through the rocks with careful placement and the current will help keep detritus from ccumulating too much.
Hi, I did install the powerhead facing down the rocks, and a lot of their poop flew around! Also, you are right, they love the flow! They face the powerhead and stay there for a while! A total treat to watch!
Your filter will take out any floating bits and while you may see floating particles at times you can polish the water by using filter floss in the the HOBs.