I suggest that you do some research on this forum about aquatic plants. Don't take the route I took; I simply purchased some plants from Petsmart and they all died. I was so frustrated and I almost quite the aquarium hobby all together. Once you get a good routine going, it's really easy to take care of aquatic plants.
I almost forgot, I kept killing the plants from Petsmart because they were actually terrestrial, lol.
Yea Petco's where I got mine. If anybody doesn't know about this, don't buy plants at Petco or it seems Petsmart. The plants they sell aren't aquatic from what I've learned and experienced.
Not entirely true..... If the plants they have avalible are in a big tank-like setup then they are aquatic. If they are in the tube things with gel covering the roots then they are generally not aquatic.