FW dip won't work if it is ich. If it is velvet then only if they have been attached for more than 24 hours, but that is still only a temporary measure and may stress the fish out. Is it in a QT tank or your main system. If it is in your main system then you need to remove all fish and treat in QT and leave main tank fishless for 4-6 weeks. Personally I like to use Cupramine.
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