Thanks for the replies! It's nice to finally have a flowering plant. I might consider removing the glass lid of my 70g to see what kind of emersed plant growth arises from the other plant species. It'd be great to see some of the other species flower.
The difficulty lies not with my aquarium, but rather with the four felines that we have. They seem to like to drink out of the aquarium, and I'm afraid that they'll fall in.... or perhaps they might like to go fishing for discus!