The first time I used it was Amquel Plus and it bleached all my zoas and killed off my anthelias. I read it not toxic if Over dosed and I believe I used more than directed. The 2nd time whne I had a power outage I used Amquel this time and I did the same thing and it caused my corals to look like crap. So both times these 2 amquels caused problems. I did throw in a bag of carbon.
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