Im setting up a 20g l tank and I'm just concerned about circulation and how it'll filter itself. I'm going to put around 20 pounds of LR in there, what kind of power head would you guys recommend? And is a skimmer a little much for a 20g fowlr? Im only going to put 2 clowns in, but when I get the money I may put some corals in, which I will get the skimmer then. As for right now, should I wait or get it now?