I just setup a a 46G bow front. My plan was to put S. Americans in it, but after reading about peacocks, I am very intrigued. My tap water has a natural ph of 8.2, which I believe is well-suited for peacocks. The question I have is...my substrate is regural gravel. Is this ok for peacocks, or is sand mandatory? Any thoughts as to how I make the peacocks happiest?