Dwarf Hairgrass will need water from 70°-83°F, with a neutral pH. This species appreciates a soft substrate that is rich in fertilizer. Also strong light will be recommended 5000 to 7000K. I am not saying you won't be able to grow but chance will be small and you will have hard time to keep it healthy. So it means says In low-tech tanks, growth rate will be slow, if at all. But in high-tech tanks with CO2 and strong lighting, they would grow much faster..