The bottled stuff is great IN THEORY, but in order for it to work propery, you'd need to use it within a few days of it being bottled. It probably sits in a warehouse for a few weeks, then on your store shelves, so by the time you see it, it has lost much of its potency. Just use the gravel, it is a tried and true method that thousands of people have had success with.
You are quite welcome. Too often, harsh advice is given and rejected. It's refreshing to see someone that is willing to listen to what someone that has been there, done that, made that mistake and learned from it, has to say. I started with a 10g tank and a boatload of fish way back when I was about 12. I'm learned a bit since then =)