I don't know if ich will affect shrimps and snails. To me, I will remove all the fishes from the tank to a hospital tank and all the rest to another tank. Then I will give treatment to the hospital tank: be it a salt bath with heater or any commercial medication.
Let the main tank run for a few weeks. Without host to attach to, it should break the Ich reproduction cycle.
Also, I cannot agree to your treatment to the fish. Any sick fish must be treated immediately, not leave it and hope that fish will recover by itself.
Regards.
Ong Poh San
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