Its common name is Dwarf saf, To have them tall plant them close togeather but for them to spread out a little more give them distance from one another. For low light though i would recommend and type of cryptocoryne. They are heavy root feeders though so either use a high iron substrate or plant tabs.
Thanks for the reply! I forgot to follow this thread and finally got around to checking back. I definitely will get some crypts when I see some good ones. The only ones I've seen of late were kind of raggedy and algae-covered, or in a tank with sick fish.

I really need some short plants to fill in the foreground of my tank a bit. Some day I'll get around to posting a pick on here, since I could sure use some advice!