I assume by your post that you want to do a reef system. Do you know if you will be doing a SPS reef or a LPS/Softie reef?
Post your water parameters, and we can give you a better idea of when to add livestock. Usually most people add their clean up crew, then some fish, and finally a few corals. After that you can add fish and corals provided everything stays stable. I would start with deciding what kind of clean up crew I want, and then making a list of all the fish I like. Then research your fish choices and edit out what won't work for you.
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