I really think it depends on the fish you plan to keep.
Even if they do all you need to do is stir it up. Might be good to do seeing you need to stir the sand up occasionally to prevent nitrate pockets in the sand. Maybe a 1 to 1 ratio?smithj427;3178322; said:won't the pea gravel sink under the sand eventually at some point?
Will Hayward;3193989; said:A mix of black, dark brown, and maroon.
One part Black, two parts brown, one part maroon.