Did GFO kill my fish

110 gallon reef aquarium live rock,corals,I did a 30% water change, I siphoned the front part of the gravel, changed my chemipure, added a polyfilter, and put a large GFO bag in the sump where the water enters.
Tank looked good on Friday when i did it and saturday,all of a sudden Sunday, the water becomes cloudy and all my fish staert gasping for air and then start dying slowly. What could have caused this. Never seen this before.
If I didnt rinse the GFO thoroughly, could this be the cause. Im stumped.:headwally:
 

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