The ich is in the tank though and really u will have to remove all or none fish. I have used ick attack and it took Alot of bottles before it cleared. Fish always have parasite and if you stress them
Out buy chasing with a net it's more harm than good. Water changes. Garlic. Selcom and something like ick attack. Herbtana. Or vital immune is a good choice. Also. I used metroplex it's a powder you put in the food which really helped for me it's a antibiotic of sorts. Just make sure you soak food overnight so it absorbs all.
If there are fish in the tank than the ich will never be gone as it used the fish to reproduce. So best is to treat the tank entire and keep it as low stress as possible.
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