So for a long time now I have always wanted to have a beautiful reef tank with lots of coral and fish, and my sister got me a 16 gallon tank as a gift with a heater, filter and aquarium salt! So I threw in some live sand and live rock, put in a powerhead, a sand sifting starfish, a tiny hermit crab and two four-striped damsels. It has been running like that for about two months now and the damsels are doing great, so I wanted to start adding some coral and a clownfish or two. But someone at petco told me if I add anything else I will have a bio overload. But it looks pretty boring as is! Is there a way to get around that and be able to add some more life and color to it? I don't want to feel like I got all excited for nothing...