2.7 Gallon Pico

[Myka]

The more often you can do waterchanges the more stable the tank will be. Pick a schedule and stick to it, the worst thing you can do is be hit or miss on the schedule. Since you've only had it set up for 2 days I assume there are no fish or corals in there yet? If that's the case, do a 100% waterchange. Generally, there will be some nitrate show up at the beginning as the cycling of the tank will create an abundance of nitrate.