Personally,
I wouldn't suggest putting 6 fish let alone any corals into a tank less than a month old. Even if it was fully cured rock. The sand can still cause a spike. Each fish you add will cause a spike. You probably won't loss anything, but the chance is there. And at the prices of most saltwater fish and corals, that is an expensive chance.
But I guess I am not the person to be giving any real advice as I just bought an Achilles Tang for my 90 Gallon which would make my tank a 2 tang tank and I will probably get flamed for this.
But good luck and let us know how everything goes.
BTW, my poilcy is leave well enough alone. I haven't done a water change in over 3 months and my tank blossoms everyday. I am overdue for one now. But I believe that 15-20% every 3 months is fine. Assuming your parameters are holding stable.
So treat you tank as you will and hopefully it works for you.
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