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Do you know how immediate the effect is? Do you think a half dose at first for a week or two would be indicator enough if it is detrimental to your system? Here's a pic of what I'm working with, I believe it to be bryopsisThe short answer is YES, there is some risk for corals. I haven't read about any troubles with fish. We have not determined WHY -- for a small portion of users -- it wipes out stony corals. But it certainly can.
I would not suggest using it to treat anything other than bryopsis. People use it to kill off algae sometimes. To me, that is being lazy or impatient.
For those with bryopsis, well, you don't have any choice really.