One month after cycle, I added couple of softies, one month later, I added few LPS, and couple of months later, I added just two SPS frags. The SPS have been doing very well for 7 weeks, so I got some more. I wanted anemone, but I changed my mind.
The most important thing is to understand your system and its behavior and how to fix or adjust something quickly. You have to be diligent with good husbandry practice.