I disagree with the no skimmer idea on a nano, unless you're really keeping practically nothing in the tank. I know lots of people do it, but I'd like to know about an older system that's been successful for a long time, and what kind of load it's supporting.

The bakpak idea is good, but you might have a problem getting it to fit; it might be too tall and not hang on correctly. I don't know. A prizm skimmer will definitely fit, and will work fine. It's also a lot cheaper. Not as well made, but might be your only option with regards to fit.

Matt