Unknown plants

I have a 10 foot one in my house. Yes you prune back the old leaves on the bottom and it grows up, the bottom becoming a trunk.
 
I have one of those as a house plant, it is just starting to shoot up and drop its lower leaves. There are colorful aquarium plants, but it is hard to find them at the petco/walmart type store. I've actually had better luck at petsmart, but they do sell non-aquatic mondo grass as well.
 
AquariaCentral.com