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Mine also is a light to a dark green. That is just telling you its working fine.
 

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I'm thinking you have "green water". Free floating algae spores in the water. It can be a common occurence in dirty tanks. Usually more associated with freshwater tanks. USMC Mike has a UV sterilizer which really helps to cut down on green water syndrome. After a few days that skimmer should sparkle clean your water and start producing black Nog.
 
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