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Hi there
If you can't quarantine them to treat them, you could try giving them a freshwater dip and keep feeding them Heavily to help build up their immune system to be able to keep it at bay also added a good UV Will also help to a degree in my opinion. Good luck[emoji846]
Can you tell us more about the system? Ich doesn't come around to healthy fish and there is something that is causing it, be it bullying, not enough room, parameter issues...whatever.