I started out with pretty much the same setup you will be and I think I've come through ok. 10 gallon tanks are shallow so with 2 of those 20 watters you will be able to keep leathers such as finger or toodstools. You will be able to keep zoanthids, palys and ricordias etc. You should manage with green star polyps and zenia. All of which are good beginner corals. Do me a favour though, stick with only the easiest variety until you can upgrade your lighting. Good luck, and welcome to the addiction.
