I've used the regular Amquel and the plus for QT's, and in shipping bags for both fish and corals. Never had a problem from the Amquel. Unless it was grossly over dosed, I'd expect the problems with your corals had more to do with what ever occured to make you add it, rather than the fact that you added it.
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Bill
"LOL, well I have no brain apparently. " - dc (Debi)
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