I'm just started planting my first planted tank last week and need some info. I saw some planted tank pictures that have very nice dwarf hairgrass carpeting the foregrounds. How do I make those nice carpet ? I mean, how many should I buy? Do they just grow and spread evenly or there is a trick to it? So far, I have all my other plants growing healthy except the hairgrass. When I bought them, they came with pots. I removed the plastic pots but had problem removing the sponge (the roots would came out). So I planted the whole the root with the sponge all together. Would this effect the growth? I still see a little brown grass here and there. All my other plants are just thriving and show beautiful green and red colors (a lot of difference compared to when I just got them) except the hairgrass. I hope they're just slow growers and not dying.