Do not even try Dwarf Baby tears or Glossostigma. Everyone loves the looks of these from various shows but they require a lot of water movement, light, and CO2. Most are actually grown in a few inches of water and then once there is a lawn, you fill the tank up.
For a basic tank I would suggest Dwarf sags or baby tears (not dwarf). They grow about 2-3in tall and eventually make a decent dense carpet.