Anyone have suggestions for a tight mat/dense mat foreground carpeting plant similar to utricularia graminifolia? I like the way it forms a very dense carpet. My water is pretty hard, pH of 7.5 or so, and I read that utricularia graminifolia prefers softer water, like pH of 6.5. The fish that are to go in the tank also prefer pHs of 7-8. Any ideas?