I agree that treating in-tank with something in a bottle is too often ineffective.
I'd buy a small tank at the LFS and setup a quarantine tank where I'd go with hyposalinity for about 5 weeks.
The thing is if one fish has Ich, it's a good bet that the other fish also have Ich. If you could QT your fish, leaving you display tank fishless for the same time period (5-ish weeks) then the Ich will be removed from that system as well - giving you a fresh, clean start.
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