if I may, there seems to be a bit of info missing here...
a few bits of info please...
How much LR do you have?
How much Live sand do you have and was all of it transfered from another tank or did you use new sand and just add some LS from an established tank?
IMO your pH is a bit too low, but I'll let you be the judge...IMO should be at least 8
Also, you have added a large bio load in a rather short period of time so if you do not have a sufficient amount of LR with a good sized bacteria bed then you will experience a "cycle" again...
One other question, what is your acclimation process when introducing your new fish, inverts and corals?