I just recently added Melafix to my tank. It hasnt harmed any inverts or corals. I used it for an engineer goby that was loaded w/ bristles to hopefully help him out. In 3 days, which is only as long as I used it the bristles were out and he seemed to be recovering but hasnt been seen since the 4th day. I dont believe he made it but they do hide alot.
I have used the herbtanna before which I think is basicly the same thing w/ good results. I havent heard of or used the other product you mention.
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