I'm interested in starting up a 20g nano reef. I'm assuming its the same as a large tank just smaller. So I will seed the tank with rock from my 125 and then build on that with dry rock. I've got some frags and other corals that will go in. I want to have a combination of sps and lps. For critters I would likea pair of fire clowns and a clown goby with fire shrimp and snails. I will be using a 15 gallon tank DIY sump/fuge with a Hydor Seltz L40 return and probably T5 lighting. That's all I've got right now...anytips? Oh and I will most likely drilling it for a Gls overflow kit.