What Fuzz says is true. GBR should be kept in a well cycled and more mature tank. My pair were the last fish I added to my tank. They also like a well planted tank with plenty of places to hide. I don't see why well planted cant translate into well "fake" planted tough.
If you really want the GBR pair, I would mature your tank with some other type of fish. Endler's Livebears are colorful and easy to keep, you could keep quite a few in a 10g tank. Or a nice set of platies, mollies, or swordtails would do great in a 10g. While 10g will limit your choices, there are MANY fish that you could enjoy in your 10g while you let it mature. Also, most fish that will do well in a 10g are easy to find new homes for, once your tank is ready for your GBR pair
How are you planning on decorating the tank? Planted? Substrate wise? What type of equipment will you be running on it? I'm sure there are many people around that will pipe up with suggestions for you 10g