sorry to go off topic.
But i'm moving to a 20 because right now i really really really dont have the money for a $100+ skimmer, and i've read and been told that a 20 gallon can get away with it. But a 30 gallon is really pushing it, and it's just less cost on rock and crushed coral. Where i live live rock and coral is incredibly expensive, so i'm trying to get an impressive display with a little less space and money.
That's something to keep in mind when you start a 30 gallon, it might be easier to spend a little less and get started with a 20. Not suggesting that, especially if you already have the 30, it's just those round about ways to get where you're going that might really help in the long run.