Sorry to hear of your losses.
1) Your water parameters look good but just because your corals thrive it does not mean it is a healthy environment for fish. But your readings do indicate the acceptance for fish. Also they survived well in the same water for 3 weeks but in a different tank.
2) Losing 10 fish over a 3 week period ( if I am correct) could mean a few predators and an efficient clean up crew.
3) Could you list what inhabitants you have and what you have lost and when?
4) At what time during the 3.5 months were the first fish added and inverts added etc.
Here is a few known points and a few questions. I have a feeling it is a mantis or a few bad crabs. Keep us posted and consider a trap in the meantime.
Good Luck
Kevin
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