Sorry to hear. I hope you get things figured out.
IMO I don't think it's the Herbtana causing the problems. I have used it full strength in my display tank with no ill effects to the fish or corals. I also use it with the Microbe-Lift Artemiss product when introducing new fish into my display tank as a pre-treatment as per the instructions on the bottle. Maybe check to ensure you dosed the proper amount.
Sorry I can't offer any more assistance. Good luck.
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