Good advice from User and good advice in that sticky. But....
especially with a small tank, you'll want to be able to check your water frequently and accurately. Accuracy requires a liquid test kit, like this one: [ame=http://www.amazon.com/API-Freshwater-Master-Test-Kit/dp/B000255NCI/ref=sr_1_1?ie=UTF8&qid=1349093361&sr=8-1&keywords=API+test+kit]Amazon.com: API Freshwater Master Test Kit: Pet Supplies[/ame]
Test strips have been shown to be inaccurate, not good when you're cycling a small tank.
What kind of filter are you using?