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Looks like Majano to me.. can you take a pic with ur white lights on and you atinics off.. if it is indeed majano you should remove it.. im sure someone will chime in with links to id hitchhickers as well as a link on how to remove it.
They do get hurt by them just grow a resistance more or less... they are fast spreading and you can keep them on check... i take it then this is not a Reef tank . If its just your clowns. Manjanos make great filter feeders