Mondo grass is simple. Just plug em where ya want em. If frog rearranges, just stuck em back...hard to kill if soil is moist/wet and some type of flouro lighting. Some pet stores sell these in tubes for viv setups. Don't waste money. Go to a nursery and ask...buy a whole flat for same price.
For example, here's a flat of dwarf Babys tears. I use this seasonally for my bonsai collection's ground cover.