Thanks for all the comments!

The sump took me a little while to figure out myself as it was all in parts, and I had only seen the "typical" design before. But now, I really like it; fairly simple, and it creates a nice little 'fuge!

I was wondering though, should I put some macro in it before the rock cycles, or wait until after? I only have the lights on in the main tank for a few hours a day, so I'm thinking I shouldn't get an algae breakout till I bump up the lighting period.