paulchiasson,
It is not because of the new water volume. I have change 50% of the water without problem. What you did was similar to a 40 % water change. It is something else.
Did you match the temperature, salinity?
Was the new sump clean? Possible contamination?
Was there DSB in the sump/refugium and there was disturbance of this sand bed?
Was the circulation lost for a long duration of time when you remove and replace the sump with the larger, newer one?
There are other cause of the stress to the coral, and it is not because the new water volume.
Minh



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