It could be related to the chemicals being added to the tank? When I switched from my 2-part to the calcium reactor I had some swings in PH, ALK, Ca and MG. All of which I just dumped "estimated" amounts of each chemical to "balance" it out, nothing died in that process.
On another note, my refract went crazy on me and I ended up bringing my salinity upwards of 1.030+ then dropped it to 1.026 within a single day. Nothing died.
By no means is my method "right" in any way, so for anyone reading this... don't do this because I got away with it. But from my experience, these corals are fairly durable if your parameters swing within reason.
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