As already been stated overhere, a community tank is just a tank with more than one fish (or invertebrates) species. Nothing more, nothing less. But you should make the difference between a biotope and a self interpreted scaped tank. That's the only difference...I understand that you have a community tank, and that's okay. I gave up on community tanks because they are overrated and dominates the hobby. I don't want to be one of the many people who admire community tanks. I'm born different.