Hmm....I'd say the best advice so far is from whosinpower.
Your main display tank is shot right now. With the absence of any live rock there is new source of nitrifying bacteria for biological filtration, hence the high ammonia levels and sickly livestock.
The main tank has to go through the cycling process again, which means that NO livestock should be in there, only rock, substrate and water. Your corals and fish need to be placed somewhere else - either QT, friend's, fellow reefer's or the LFS.
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