bannerfish

Saw this in LFS today, it is labeled as acuminatus but looks like diphreutes to me based on the anal fin and number of dorsal spines (12 as opposed to 11). Does anyone with ID skills have any thoughts? I'd hate to get the wrong fish and lose coral, thanks!

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I started dosing cupramine two days ago, and im slowly raising it. The other fishes in the other qt tanks are doing ok. In one of the tanks though, there is a bannerfish. My bannerfish is laying on the bottom of the tank. The bannerfish is suffering from a bad case of ich. Im not sure what to...