Why don't we just agree to disagree.

Cleaner shrimp do eat parasites on fish. Most sources indicate that they do not remove cryptocaryon, as it buries so deeply into the fish.

Personally, I do recommend cleaner shrimp - and have had them in the past. Unfortunately, my old flame hawk decided he'd rather eat than be clean... I just don't believe they are a cure or even much help, specifically with marine ich.

To each his own - I've seen many, many theories grow and die in the 35+ years in this hobby. Like I said, let's just agree to disagree - and let the OP decide what to do.