I agree with the previous posts that ich is something that lies dormant in your tank waiting for a fish to become stressed before it attacks. Just FYI coral beauties as a whole tend to stress easily. It does not surprise me one bit that yours got ich when he was introduced. I wouldn't stress out about it to much if he's dealing with it and the ich isn't actually killing him. I can tell you from personal experience that they are more prone than other fish to ich. In all honesty I would get him a cleaner shrimp and let them become good friends. (This is of course assuming that you don't get a killer ich episode. Most of the time coral beauties can cope)
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55gal,216 watt Tek T5, 45#LR, 45#LS, 3 maxi-jet 900's on a natural wavemaker timer,phosban reactor, 5 gal fuge (built out of standard 10 gallon tank) with chaeto and feather caulerpa, sealife systems protein skimmer, wet/dry, 3 blue/green chromi, 1 skunk cleaner shrimp, 1 coral beauty,1 scopas tang, 2 false percs, 5 mexican turbo snails, assorted dwarf blue leg hermits, astrea snails, and nerite snails | 
