You can start adding livestock as soon as your tank has cycled. When ammonia and nitrites have hit zero start checking your nitrates. I would suggest doing a water change or two at this point to help lower the level of nitrates produced during the cycle. Usually around 6-8 weeks after setting up your tank and adding liverock and sand you should be ready to start adding livestock. It is only recommended that you start with softies because they are generally easier to keep as compared to other corals. Softies are a great starting point to gain a better understanding for keeping corals and softies usually have a larger margin of error than other corals. Really you can start with almost anything, including a frogspawn, zoanthids, etc.
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