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I had a "death tank" that I tracked down to a cracked heater leaching heavy metals into the water. My results were very much like yours. All tests were fine, even tried a copper test, which didn't register at all. However, it takes very, very little metal contamination to kill soft corals!
You're not going to like my solution. I did a complete (and expensive!) teardown, throwing away all rock, powerheads, heater, media, sediment... I kept the tank, lights, skimmer body, HOT filter, and that's about it. Started clean over. Now everything grows like a weed (especially Bryopsis; wait, that *is* a weed...).
Dan
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