Have you tested nitrite at all? If there was ever a reading other than "0" it would have pointed to an ammonia spike that you maybe missed.
You should have asked on here for pointers before you transferred. At the very least, you should have left the new sand out until everything was moved over and settled in for a couple weeks. I wouldn't have setup the new tank with all new water (sound like that's what you did). I think you made a few small "mistakes" that added up and are causing some sort of water quality issue - I suspect some kind of bacteria problem. Add to that the stress of the move, and then being in the cloudy water in an unfamiliar setting and I think it was too much. When a tank transfer is done well you will not see an ammonia blip at all.
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~ Mindy
SPS fanatic.
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