Consider a UV fiter, or ozone reactor.
Both these kill the free floating ich.
Once they die in the water column they will not reproduce again, till you add a new source of ich.
Uv filter is the better choice over an ozone reactor.
note this will kill other microscopic life and illness but as a cure it is good.
You can choose to discontinue it after it has cured your ich.
....
Cleaner wrasse or cleaner shrimps, you can try to find a blue neon goby (the goby are rare but have a good survival rate over the cleaner wrasse)
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