If you do not do a proper treatment, you will always have ich in your tank. It's going to come and go and any new addition that will be stressed might trigger a new outburst of ick.
The best is to remove all of your fish and treat them all, then leave your main tank without fish for 6 weeks or so. That's the only way you are going to be free of ich, or you will have to endure this every now and then.
If you ever use Cupramine, make sure you do not use any water treatment like Prime as it will bind with the amine in Cupramine and release the copper into a toxic form.
Another treatment could be Seachem paraguard and it's quite safe but not for the coral or invert. To be done in a quarantine tank. But at least you could have some liverock in there and have a decent water quality. With copper you cannot put any liverock and ammonia can build up quite fast so this must be checked each day, preferably twice a day.
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