When i talked with them at macna, they told me that they could not say it was reef safe. This was due to if you had a bucket of water with a coral, the coral would die. But when they used it in full reef tanks, nothing died. So they said that it was possible to use in a reef tank, but they couldnt necessarily say reef safe due to the coral bucket experiment. But itst mostly for curing diesease in fish, which most people do in QT.
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No worries I was just wondering, I had never heard of it before. I find a lot of that stuff to add lots of stress on your system so I tend to stay away from it. And my fishies are healthy so no worries Thanks anyway!
