Hi Jason
to TR!
Raymond gave you some good reading material. One of the things that is counter-intuitive is that the LFS (local fish store) can give you bad advice. (Big box pet stores almost always give bad advice.) Sometimes this is ignorance and sometimes greed. Before you buy anything I urge you to run it by us first. We don't have anything to gain by urging you to buy something that isn't suited to your tank, unnecessary or you aren't ready to keep.
If you are planning to keep corals use the bio-balls that come with the nano as cat toys. I don't use the sponges either. If you opt for them they need to be kept clean so they don't build up nitrates.
You will probably want to pick up another powerhead to improve the circulation. I bought a Koralia Nano for my NC24 and wish I had bought the Koralia 1. The best prices around are
http://theculturedreef.com/talkingreef.htm.
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