As much as it's a PITA to have to tear your tank down, I suggest you do it and put in a new bulk head fitting and rubber gasket, BTW that bulk head in the picture is not a nut on the top water side. I've seen those before they have a full length female thread, just another style.
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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