I have been looking at several types of planted tanks, and Iam very interested in gettting a grassy like substrate. However I don't know of any of the types of plants they look like grass, and also don't know the requirements. I keep piranha's and all my tanks have a inch and a half of standard gravel, and havethe basic lighting that usaually comes with the tanks, I looking for plants that use low light and no co2. Please help me out if you can with suggestions and steps. Thanks ahead of time