i woudnt think your would need more then 4 weeks, but if you say it happened to you after that period, then i guess i cant argue with that.
personally i dont like to treat unless i feel its necessary. i have 5 fish in quarantine right now. thursday will be 4 weeks. i do not plan to treat copper unless ich appears, so far it has not. im even debating prazi. i may not treat at all.
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