If they are AEFW's and you don't have any acro's, they will just die off on their own. AEFW's are tranparent, and hard to see. The regular kind are usually red in coulour and harmless. They can infest your tank and look unsightly, but I don't think they hurt anything. I also wouln't recomend a freshwater dip on LPS. You should to an Iodine dip in Tankwater.
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