Folks tend to ignore nitrite readings now, and low ammonia suggests your safe for fish. You could add a bacteria source from an existing system through additions of live rock for example but then you should wait to turn the lights on for a while (or at least only use dim light) while that bacteria circulates and coats your tank and rock. Alternatively, expect an algae fest. Welcome to reefin.Can't figure out what number this is 2ppm or 5ppm, anyone?