Not clear that feeding CP is helpful for Ich. The normal mechanism for treatment is to kill the free-swimming tomites in the water, before they can find the fish. After about 12 days, there shouldn't be any parasites on the fish, providing you have prevented reinfection.
Before you suspend treatment, it's a good idea to move the fish to a clean tank. That separates the fish from any residual living cysts in the treatment tank.
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Stuart
Current Tank Info: 300G Caribbean biotype reef set up in 2003.
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