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The use of a UV light in the reef (MAY) I'M not saying it will stop it if you have it it now.. UV will benefit with treating and or preventing the spreading of certain coral pathogens. All pathogens must of course be waterborne to be killed they pass through the UV. This means that any biotic disease that will pass through will die off.. Only put this up because some say a UV will not do anything for the a reef tank