Just saw your second post. I did the hyposalinity (brought mine down to 1.014). At the time I had three snails and 15 hermits with my fish. The snails did fine until I added the copper. They even lasted a week after that. None of the hermits died. In fact I have only brought my tank up to 1.018 and I have put some copper in the tank and have 28 hermits running around with no problem. Small changes can make a difference expecially if done quickly and not put off. If you already have your tank at 80 raise it to 82 and drop your salinity by two points. You may be able to make a difference without meds. If you at all possible can catch and dip or QT your achillies I would though. I know how impossible that can be though. My regal tang is nil impossible to catch. I've tried every trick in the book to get him and it just doesn't happen unless I pull out everything from the tank. I hope this helps. I remember your post about how excited you were when you got your achillies. They are beautiful fish for sure. Even worth the trouble they cause.
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