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Ick cannot survive without a host fish....just fish...nothing else.
Yup 70 days is more than long enough.
Likely, if you have, came with the tang....they are prone to this.
If you have, tank must go fish less for at least 8 weeks.
Treat any fish you want to keep with either hypo salinity or cupramine see sticky notes.
Once they stop eating, suspect Ick.....starts in the gills and spreads.....most people treat outside the DT so they do not kill others and biological filter and have to cycle all over...
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