D A big part of having a Reef is being a responsible Owner, There are some inhabitants that we can't keep with out suffering consequenses. Having a bigger system would afford you to have more variety, Either bigger Fish, more demanding Coral or a much bigger Pod population for manderins or Sandsifting Starfish. There comes a point when you have to say no I can't safely keep what ever, It's like an Anenome, Lots of people like that relationship they have with their Clowns, But can your system support the animal? Some don't care and most will actually think and research. I'd wait until you're sure you can support the animal, Just something to think about.