My thinking is this: there are easy aquatic plants and some aquatic plants that aren't as easy to grow. There are even non aquatic plants that get sold as "aquarium plants". Part of what makes a plant easy is how little light it will still grow under, thus my question about your light. What kind of lightbulbs are in your light? wattage, and whether it is incandescent or fluorescent and how many bulbs would be the information that would give me an idea what you are working with.
The easiest method to share what plants you have would be by photograph, but we can deal with it if you aren't able to by just giving descriptions of your plants(what do the leaves look like, how does it grow/shape of plant). I'll try to figure out what you have and post photo/links to pictures of my guesses for you to match yours to or to say that isn't quite right.
It is one thing to say plants can be great in a fish tank, and quite another to specifically say that plant should grow in your tank and this other plant probably won't grow and would be better to take it out since it would only rot in there. I'd like to be able to give you some of my experience with plants in this way.