I don't like to say it, but Green Chromis aren't a very good fish to start with! They are mean little bastards, and will probably pick on other fish when you want to add, and then they are a pain in the butt to catch when you decide you want to get rid of the little pricks. Some people recommend them as starter fish because they are very tough little fish, but the reasoning behind it is hugely flawed. If you need tough fish to survive the first few weeks of your tank, then you probably didn't wait long enough to add them in the first place!
