It can, I hope you e running a good protein skimmer. Are you using a grid feeding clip, veggie clip or rubber banding the Nori to a shell?
http://www.drsfostersmith.com/Product/NavResults.cfm?N=2004+112972 One of these methods may help reduce the amount of Nori that gets blown around as a result of your angels’ behavior.> Lastly, will the combination of Nori and a few Mysid shrimp a day keep this fish healthy in quarantine.