My thought would be the ph, have you checked the ph of the water your frag was in prior to putting it in the tank. If it was at say 8.2 to 8.4 then goes into your tank with a ph of 7.9, that is a huge swing. The corals that are in there already probably got used to the declining ph over time.
Not sure why your ph would be so low. Something is causing your water to be too acidic, hopefully someone can chime in on that.
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